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Zosterops
Zosterops
Zosterops
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Zosterops
Z. palpebrosus egregius, Sri Lanka
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Zosteropidae
Genus: Zosterops
Vigors & Horsfield, 1827
Type species
Motacilla maderaspatana (Malagasy white-eye)
Linnaeus, 1766
Species

See text

Zosterops (meaning "eye-girdle") is a genus of passerine birds containing the typical white-eyes in the white-eye family Zosteropidae. The genus has the largest number of species in the white-eye family. They occur in the Afrotropical, Indomalayan, and Australasian realms. Typical white-eyes have a length of between 8 and 15 cm (3 and 6 in). Their most characteristic feature is a conspicuous white feather ring around the eye, though some species lack it. The species in this group vary in the structural adaptations of the tongue.[1] The Zosterops [griseotinctus] group is an example of a "great speciator" inhabiting a vast area and showing a remarkable morphological differentiation on islands, some of which may be as close as 2 km (1.2 mi) apart.[2]

Systematics

[edit]

The genus Zosterops was introduced by the naturalists Nicholas Vigors and Thomas Horsfield in 1827.[3] The name combines the Ancient Greek words zōstēros "belt" or "girdle" and ōpos "eye".[4] The type species was designated as the Malagasy white-eye by René Lesson in 1828.[5][6]

The results of a series of molecular phylogenetic studies of the Zosteropidae published between 2014 and 2018 prompted a major revision of species limits, in which 10 new genera were introduced. In the reorganisation, the English names of three of the existing genera were replaced.[7][8][9][10][11]

Additionally, a study on Sri Lanka white-eyes (Zosterops ceylonensis) and Indian white-eyes (Zosterops palpebrosus) suggests that the Sri Lanka white-eye is the root species and the origin of all Zosterops species.[12] This raises questions upon the former theory of Southeast Asian origin.

Species

[edit]
Black-capped white-eye
Z. atricapilla
Mauritius grey white-eye
Zosterops mauritianus
Mauritius olive white-eye
Zosterops chloronothos

There are over 100 species in the genus. This includes three species (denoted by a dagger † in the list below) that have become extinct since the 16th century.[11]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Zosterops

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from Grokipedia
Zosterops is a of small birds in the white-eye Zosteropidae, renowned for their distinctive ring encircling the eye, which gives the group its . Comprising approximately 111 (as of 2024), Zosterops represents one of the most diverse and rapidly radiating genera among passerines, with many exhibiting high to islands or archipelagos across their range. These birds are typically 9–15 cm in length, with plumage often olive-green or yellow above and paler below, though varying across , short pointed bills, and brush-tipped tongues adapted for feeding, alongside a diet that includes insects and fruits. Native to tropical and subtropical regions of , southern and eastern , , and the Pacific islands, Zosterops inhabit diverse environments from forests and woodlands to gardens and shrublands. They are highly social, often foraging in mixed flocks, and some demonstrate remarkable adaptability as colonizers of human-modified habitats and long-distance dispersers.

Taxonomy and Systematics

Etymology and History

The genus name Zosterops is derived from the Ancient Greek words zōstēr (ζωστήρ), meaning "girdle" or "belt," and ops (ὄψ), meaning "eye" or "face," alluding to the prominent white ring encircling the eye that is a defining feature of many species in the genus. The genus Zosterops was formally established in 1827 by the British naturalists Nicholas Aylward Vigors and Thomas Horsfield in their paper "A description of the Australian birds in the collection of the Linnean Society; with an attempt at arranging them according to their natural affinities," published in the Transactions of the Linnean Society of London. The type species was designated subsequently by René Primevère Lesson in 1828 as Motacilla maderaspatana Linnaeus, 1766, now recognized as the Malagasy white-eye (Zosterops maderaspatanus). Early classifications placed Zosterops within the family , the warblers, due to superficial similarities in plumage and habitat preferences. This changed in the mid-19th century when elevated the group to subfamily status as Zosteropinae in 1853, recognizing their distinct morphological and ecological traits, such as the brush-tipped tongue adapted for nectar feeding; it was later raised to full family rank as Zosteropidae. Prominent 19th-century ornithologists contributed significantly to the early taxonomy of Zosterops. John Gould described several species, including the white-breasted white-eye (Zosterops albogularis) in his 1848 work The Birds of Australia, based on specimens from northern Australia and New Guinea. Similarly, Otto Finsch named and described multiple Pacific Island species, such as Zosterops finschii (now synonymous with Zosterops hypoxanthus) in his 1875 monograph on New Guinea birds, expanding knowledge of the genus's diversity in Oceania.

Phylogenetic Relationships

The genus Zosterops forms the core of the family Zosteropidae, a of small Old World tropical birds primarily distributed across , , and . Within Zosteropidae, Zosterops is closely related to genera such as Rukia (e.g., the teardrop white-eye Rukia ruki) and Speirops (African white-eyes), with phylogenetic analyses based on ultraconserved elements (UCEs) resolving seven higher-level clades in the family, including an early-branching group of yuhinas and a later radiation encompassing Zosterops. The family as a whole is sister to the babblers (Timaliidae) and originated in the mid- to , with Zosterops exhibiting a ladderized structure indicative of sequential branching during its diversification. Phylogenetic studies between 2014 and 2018, utilizing (mtDNA) such as ND2 and nuclear genes, prompted significant taxonomic revisions within Zosterops, including the recognition of in widespread complexes and the elevation of to full status. For instance, analyses of 173 individuals across 42 taxa revealed that the Oriental white-eye (Z. palpebrosus) complex comprises at least four distinct , while the Japanese white-eye (Z. japonicus) includes two, highlighting the need for further delimitation. These efforts, combined with broader genomic work, led to the splitting of several lineages into new genera (e.g., Tephrozosterops for somber grayish forms), increasing the recognized count in core Zosterops from approximately 80 to 103 (Meier et al. 2021), with further taxonomic revisions resulting in 111 as of 2024 (Cornell Lab of 2024), while expanding family-level diversity to 13 genera. Such revisions underscore the genus's historical lumping of morphologically cryptic island endemics. The white-eye (Z. ceylonensis) is proposed as the basal species in the Zosterops phylogeny, diverging from other congeners approximately 1.79 million years ago (95% highest posterior density: 1.31–2.32 million years ago) based on Bayesian analyses of mtDNA (ND2, ND3) and nuclear TGFB2 genes. This early split supports an Asian origin for the , with subsequent rapid radiations in the Afrotropics and regions driving high diversification rates, particularly among island endemics—historically encompassing nearly 99 species in a span of 1–3.5 million years. The Indonesian archipelago, especially , emerges as a key evolutionary hotspot, where all three major Zosterops clades (Indo-African, Asiatic, Australasian) overlap and exhibit elevated lineage diversity. Evidence of hybridization complicates phylogenetic boundaries, particularly in Australasian groups, where genomic analyses detect secondary via methods like ABBA-BABA tests—e.g., between the yellow-bellied white-eye (Z. auriventer) and thick-billed white-eye (Z. hypoxanthus). In Afrotropical lineages, permeates the phylogeny regardless of , as seen in multi-locus studies of mainland and island forms, further blurring species limits amid ongoing adaptive radiations.

Species Recognition

Species recognition within the genus Zosterops relies primarily on a combination of plumage patterns, vocalizations, and genetic markers, as many taxa exhibit cryptic morphologies with subtle distinctions such as variations in eye-ring completeness or underpart coloration tones. For instance, differences in plumage tone and eye-ring width often serve as key field identifiers, while song structure and call repertoires provide additional discriminatory cues in overlapping ranges. Genetic analyses, including sequencing, further refine boundaries by revealing phylogenetic divergences that may not align with visible traits. Challenges in delimiting Zosterops species arise from high intraspecific variation and frequent hybridization, which obscure morphological and genetic boundaries. Populations within the Z. griseotinctus group, for example, display notable morphological differentiation across islands—such as in bill size and plumage hue—but maintain genetic similarity indicative of recent divergence or ongoing . Hybrid zones, as observed between Z. lateralis and Z. tenuirostris in , complicate identification due to intermediate phenotypes and shared vocal elements. Recent taxonomic revisions have elevated several to full status, informed by integrated evidence from the 2011 HBW/BirdLife checklist and subsequent studies. A prominent example is the split of Z. kulambangrae (Solomons White-eye) from the former Z. kulambangrae complex in the , based on contrasts, vocal distinctions, and genetic data. These updates reflect broader patterns of insular , contributing to the current recognition (as of 2024) of 111 and over 140 across the . Several Zosterops taxa have gone extinct due to anthropogenic pressures, including three full species—the Lord Howe Island white-eye (Z. strenuus, lost around 1918), the Marianne white-eye (Z. semiflavus, ~1900), and the white-chested white-eye (Z. albogularis on Norfolk Island, last recorded in 1979 and declared extinct in 2024)—as well as the Guam subspecies of bridled white-eye (Z. c. conspicillatus, extinct by 1983). Diagnostic tools have advanced species identification in the field and for conservation, with bioacoustics enabling rapid differentiation of cryptic forms through analysis of vocalizations. , using the mitochondrial COI gene, complements this by confirming identities in traded or degraded specimens, as demonstrated in Southeast Asian Zosterops populations.

Physical Description

Morphology

Zosterops species are small, compact birds, typically measuring 8–15 cm in total length and weighing between 6 and 20 g, with variations influenced by island size and latitude under , where larger individuals occur in cooler environments. They possess short tails relative to body size, contributing to their agile, arboreal profile, and exhibit slight size differences across , such as wing lengths ranging from 50–80 mm. A defining morphological feature of the genus is the prominent white eye-ring, formed by specialized tiny feathers encircling the eye, though it is interrupted anteriorly by a black or dusky loral streak in most species and absent in others, such as Zosterops anomalus. In some taxa, the ring incorporates areas of bare circumorbital skin, which may appear bluish or dusky, enhancing visibility and potentially aiding in species recognition. The bill is short, slender, and pointed, adapted primarily for insectivory through and probing, with exposed culmen lengths averaging 8–12 mm across . The tongue features a brush-like tip in many , facilitating extraction by and contact with floral rewards, though structural variations exist, including more fimbriate forms in some African lineages and tubular extensions in certain Australasian groups. Wings are short and rounded, with 9–10 primaries, enabling maneuverable flight in dense foliage, while legs and feet are relatively weak and slender, suited to perching in trees rather than ground-based activities, with tarsus lengths of 14–20 mm. is minimal, with species generally monomorphic in and structure, though males may be slightly larger (1–2% in wing length) in select taxa.

Plumage Variation

The plumage of Zosterops typically features olive-green upperparts, yellowish underparts, and a conspicuous white eye-ring that encircles the eye, serving as a diagnostic trait for the . This general pattern provides in forested habitats, with the eye-ring enhancing visibility during social interactions. Some exhibit additional yellow accents, such as on the rump or flanks; for instance, the silvereye (Z. lateralis) displays a bright yellowish-green rump and uppertail-coverts, contrasting with its greyish-tinged upper back. Plumage variations across species are often subtle, particularly in cryptic taxa, where differences in underpart coloration—such as pale versus darker tones—aid in distinguishing closely related forms. In African species, the Orange River white-eye (Z. pallidus) stands out with its pale olive-green upperparts, yellow throat, and distinctive tawny-buff flanks, differing from the more uniformly yellow-bellied Cape white-eye (Z. virens). Island populations frequently show clinal variation, with gradual changes in hue or intensity along geographic gradients; subspecies of Z. lateralis across and nearby islands, for example, transition from uniform olive-green forms to those with intensified yellow throats or greyer breasts. Juvenile plumage is generally duller than that of adults, with reduced saturation in and tones and an incomplete or absent eye-ring that develops post-fledging. Young birds typically undergo a complete moult to plumage within their first year, acquiring the full eye-ring and brighter colors. is minimal, with males and females showing nearly identical patterns, though some display slightly brighter breeding plumage in males, such as intensified yellows on the underparts during the reproductive season. Exceptions to the typical pattern include reduced or incomplete eye-rings in certain , as seen in the black-headed white-eye (Z. hypoxanthus), where the white ring is of moderate width but broken anteriorly by black head ; some lack the eye-ring entirely, such as the black-ringed white-eye (Z. anomalus) and Réunion grey white-eye (Z. borbonicus). All-black forms are rare within the genus, though some approach this with extensive melanistic head feathering, like the melanops race of Z. lateralis, which has a blackish forehead and forecrown against otherwise olive-green .

Distribution and Habitat

Geographic Range

The genus Zosterops is distributed across the Afrotropical, Indomalayan, and Australasian realms, spanning and in the Afrotropics, South and Southeast Asia in the Indomalayan region, and the Pacific islands along with in the . The genus is absent from the Neotropics and the Palearcics. is highest in the islands, with significant concentrations in areas like , where rapid s have produced numerous taxa amid complex archipelagic environments. In contrast, the African includes approximately 20 across the mainland and offshore islands. Human-mediated introductions have facilitated range expansions for certain species; notably, the Japanese white-eye (Z. japonicus) was transported to between 1929 and 1937, where it has since established widespread populations. Separately, Swinhoe's white-eye (Z. simplex) was introduced to , with the first individuals documented around 2006, and has since established expanding populations, spanning over 300 km as of 2025. Over 70% of Zosterops species are island endemics, exemplified by the extinct robust white-eye (Z. strenuus), which was confined to . Pre-human distributions were generally more restricted, with many lineages limited to isolated s, and post-colonization extinctions have further reduced ranges on such habitats.

Habitat Preferences

Zosterops species exhibit a broad array of preferences, predominantly favoring edges, gardens, mangroves, shrublands, and across their range. These birds are highly adaptable to human-modified landscapes, including plantations and urban areas, which facilitates their colonization of disturbed environments. For instance, the (Z. japonicus) thrives in open forests, mangrove thickets, gardens, and urban settings, demonstrating this versatility in both native East Asian habitats and introduced populations in . In terms of altitudinal distribution, Zosterops occupy elevations from to over 3,000 m, with many showing flexibility across gradients. Montane endemics, such as the Ethiopian white-eye (Z. poliogastrus), are restricted to highland forests and woodlands in the , occurring between 1,200 m and 3,800 m. This prefers cooler, moist environments in these elevations, highlighting the genus's ability to exploit varied topographic niches. Microhabitat use within these areas is primarily arboreal, with Zosterops favoring the canopy and mid-story layers for foraging and nesting, while generally avoiding the dense interiors of primary rainforests. They are more abundant in open glades and edges than in closed-canopy s, as observed in species like the Kulal white-eye (Z. kulalensis), which prefers montane forest glades during the dry season. The orange-river white-eye (Z. pallidus) exemplifies adaptation to open shrublands, such as semi-arid and fynbos-like vegetation, where it occupies scattered tree stands and thickets. Overall, Zosterops are associated with tropical and subtropical climates but extend into temperate margins, particularly in urban and modified habitats. Their tolerance for disturbance-driven changes, such as and agricultural edges, has enabled rapid range expansions in fragmented landscapes.

Behavior and Ecology

Foraging and Diet

Zosterops are omnivorous birds with a diet comprising primarily small arthropods such as and spiders, from flowering plants, and fruits including berries and small seeds. This varied intake supports their high metabolic demands, with arthropods providing essential proteins, particularly during the breeding season when consumption increases to meet nutritional needs for . In non-breeding periods, the diet shifts toward a greater reliance on fruits and , reflecting seasonal availability of resources. Foraging techniques in Zosterops involve insects and spiders from foliage, branches, and bark, often by probing or picking directly from surfaces. is accessed through hovering or perching at flowers, facilitated by a specialized brush-tipped that efficiently collects the liquid, similar to methods used by sunbirds. Fruits are typically swallowed whole if small (under 8–10 mm in diameter) or pecked for pulp, with some species like the lemon-bellied white-eye (Zosterops chloris) showing a preference for berries. These birds frequently join mixed-species flocks, which may enhance efficiency by increasing the detection of sources through collective vigilance. Zosterops are highly gregarious , typically in noisy parties of 5–20 individuals that move actively through . Such allow for coordinated searching and reduce individual predation risk while . These flocks often vocalize during activity, though the primary benefit appears to be improved location in dense habitats. Foraging activity occurs throughout the day from dawn to , with peaks in the early morning and late afternoon when levels favor visual of . During breeding, the emphasis on insectivory intensifies to provision nestlings, aligning with higher abundance in warmer months.

Reproduction

The breeding season of Zosterops species varies widely by geographic and local , often aligning with periods of increased food availability such as the rainy season. In , for example, the Cape white-eye (Z. virens) breeds from September to , while in equatorial African regions, breeding may extend from October to March. In tropical Asian and Pacific populations, such as the (Z. japonicus), breeding occurs from to , with some species capable of year-round in equatorial . Nests are typically cup-shaped structures woven from fine grasses, moss, lichen, spider webs, and other plant fibers, often suspended in the fork of slender branches within dense foliage 1–10 meters above ground. Both sexes collaborate in nest construction, which generally takes 5–10 days to complete, though durations can vary; for instance, the requires 7–10 days, while the Mauritius grey white-eye (Z. mauritianus) completes nests in about 4–5 days. Clutches usually consist of 2–4 eggs, which are pale blue to greenish-blue and may be immaculate or sparsely marked with reddish-brown spots concentrated at the larger end. Incubation lasts 10–14 days and is primarily performed by the female, who is fed by the male during this period, though both parents share duties in some like the . Parental care is biparental, with both adults feeding the altricial nestlings a diet rich in and soft fruits, and removing fecal sacs from the nest. Nestlings after 9–12 days, remaining dependent on parents for several weeks post-fledging. Multiple broods per season are common, with up to three successful clutches possible per pair in favorable conditions, as observed in the Japanese white-eye (Z. japonicus). In the wild, Zosterops individuals typically have short lifespans of a few years on average, though maximum reaches up to 18 years in some , supported by high reproductive output that offsets predation on eggs and young.

Vocalizations and Sociality

Zosterops species exhibit a diverse vocal repertoire characterized by high-pitched, twittering calls that serve primarily as contact signals within flocks. These include soft, elastic whistle-like notes, such as the "tseet tseet" calls produced by foraging groups or pairs moving through vegetation, which advertise location and maintain cohesion during travel. Alarm calls, often described as harsh "chitter" scolds or elongated nasal whines, are emitted by both sexes in response to disturbances or threats, frequently preceding aggressive displays or beak clattering. In Zosterops lateralis, distinct call types include flight calls for coordinating movement, alarm calls signaling danger, and threat notes initiating aggression, all contributing to flocking dynamics. Songs are simpler and less complex than in many oscines, with males delivering a loud primary song—a melodious warble from exposed perches—to defend territories, peaking at dawn during the breeding season from mid-December onward. A quieter whisper song, produced by both sexes during rest periods, may occasionally incorporate mimicry of other avian sounds but remains rare across the genus. These vocalizations play key roles in social functions, with contact calls essential for sustaining flock unity during non-breeding periods and songs reinforcing pair bonds and territorial boundaries during . calls from juveniles, consisting of throaty whines and squawks accompanied by wing quivering, elicit parental feeding responses. Overall, the vocal array supports communication in dense, mobile groups, adapting to in urban settings by shifting pitch and independently. Socially, Zosterops are highly gregarious, forming large winter flocks exceeding 100 individuals that forage and roost communally, often including mixed-species associations for enhanced vigilance. Within these flocks, stable dominance hierarchies emerge, maintained through low-level such as supplanting, chasing, and ritualized displays like wing fluttering or beak clattering, with dominant birds initiating more encounters over resources. In Zosterops lateralis, hierarchies form peck-right orders, occasionally complicated by mated pairs, and peaks at feeding sites but remains subdued outside breeding. Allopreening reinforces bonds, particularly during when pairs form in flocks via close following. Roosting occurs in tight clusters of mates or siblings, with birds tucking heads into feathers for rest. The mating system is predominantly monogamous, with pairs often bonding for multiple seasons or life, though occasional extra-pair copulations occur, as documented in island populations of Zosterops lateralis where genetic analysis revealed variable paternity rates. is observed in select species, such as the Seychelles White-eye (Zosterops modestus), where non-breeding helpers assist at nests, contributing to extended post-fledging care up to six weeks. Territoriality intensifies during breeding, with pairs defending small areas, but overall remains minimal in the communal daily life of flocks.

Conservation Status

Major Threats

Habitat loss and degradation pose the most significant threat to many Zosterops species, primarily through for and , which fragments forest edges and reduces suitable woodland habitats essential for and breeding. This impacts over 30 species across the genus, particularly island endemics; for instance, the Lord Howe silvereye (Z. lateralis tephropleurus) faces ongoing pressure from lowland forest clearing and invasive weeds on its restricted range. Invasive species exacerbate declines, especially on oceanic islands where introduced predators like rats, cats, and the prey on eggs, chicks, and adults, while competitive interactions displace natives. Rats contributed to the of the robust white-eye (Z. strenuus) on by the early 20th century, and the drove the Guam bridled white-eye (Z. conspicillatus) to by 1983. Additionally, the introduced Japanese white-eye (Z. japonicus) competes aggressively for and nectar resources with native Hawaiian forest birds, leading to reduced growth rates and survival in species like the Hawaii akialoa. Climate change further endangers island populations by altering nectar and insect availability through shifting and increasing storm frequency, while sea-level rise threatens low-lying habitats. For the Sangihe white-eye (Z. nehrkorni), habitat shifting and are projected to indirectly degrade ecosystems, confining the to a single shrinking locality. Island endemics like the Gizo white-eye (Z. luteirostris) are particularly vulnerable to intensified tropical cyclones that destroy vegetation. Direct human activities, including trapping for the Asian pet trade and pesticide use, compound these risks. In , species such as the Javan white-eye (Z. flavus) and Wangi-wangi white-eye (Z. paruhbesar) have undergone rapid population declines—up to 80% in a decade for Z. flavus—due to illegal capture for cage birds. Pesticides in agricultural areas diminish prey for insectivorous Zosterops, indirectly affecting breeding success in species like the African yellow white-eye (Z. senegalensis). These threats have led to high extinction rates within the , with at least three extinct—the robust white-eye (Z. strenuus), Guam bridled white-eye (Z. conspicillatus), and Marianne white-eye (Z. semiflavus)—primarily from predation and habitat loss. Over 20 Zosterops are currently threatened with according to IUCN assessments, highlighting the genus's vulnerability.

Conservation Measures

Conservation measures for Zosterops species emphasize habitat protection, management, and targeted interventions to address population declines, particularly for island endemics vulnerable to anthropogenic threats. Establishment of protected areas has been crucial, with national parks and reserves in safeguarding endemic species such as the Madagascar white-eye (Zosterops maderaspatanus), where forest preservation supports stable populations across the island. Similarly, island sanctuaries like , a , provide critical protection for the endemic Zosterops lateralis tephropleurus, restricting human activities to minimize disturbance in its sole habitat. Invasive species control programs have significantly benefited Zosterops populations by reducing predation pressure. On , ongoing efforts to manage ship rats (Rattus rattus), which devastated related taxa like the extinct robust white-eye (Zosterops strenuus), indirectly support the persistence of Z. lateralis tephropleurus through habitat-wide predator monitoring and control. In the Pacific, initiatives, such as those outlined in regional plans for and , prevent further introductions of invasives that threaten white-eyes, including protocols for and on islands hosting species like the Saipan white-eye (Zosterops saypani). Eradication successes on seabird islands have enhanced foraging opportunities for Z. lateralis by limiting rat predation on and fruits central to its diet. Research and monitoring underpin effective conservation, with IUCN Red List assessments guiding priorities for numerous Zosterops species, such as the extinct white-chested white-eye (Zosterops albogularis) (uplisted to Extinct in 2024) and Gizo white-eye (Zosterops luteirostris). Genetic studies have informed reintroduction efforts, including genomic analyses of Z. lateralis that reveal adaptive potential for translocations, and population viability assessments for the Mauritius olive white-eye (Zosterops chloronothos) that highlight low diversity risks. For instance, conservation introductions of the Saipan white-eye (Z. saypani) from Saipan to Sarigan in the Northern Mariana Islands relied on genetic screening to ensure founder viability. Captive breeding programs target critically endangered taxa, with facilities rearing bridled white-eyes in biosecure environments to bolster wild releases and support reintroductions in the Pacific. These programs emphasize genetic diversity maintenance to prevent inbreeding in small populations. Policy frameworks include CITES Appendix I listing for Z. albogularis, prohibiting international trade to curb overexploitation observed in related species like the Javan white-eye (Zosterops flavus). Habitat restoration through reforestation in Southeast Asia targets white-eye strongholds, such as proposed programs on Wangi-wangi Island for Z. paruhbesar and broader efforts in Sangihe to expand suitable forest for critically endangered congeners.

Species List

Extant Species

The genus Zosterops encompasses approximately 111 extant of , reflecting rapid and recent taxonomic revisions, including a 2018 molecular study that proposed significant adjustments to species boundaries based on . These are predominantly found in tropical and subtropical regions, with distributions centered in (about 14 ), (over 50 ), and the Pacific (around 40 ), often exhibiting high on islands. Many are polytypic, with notable variation in and vocalizations across , and several have established introduced populations outside their native ranges due to human-mediated dispersal. For a complete list of species, refer to authoritative sources such as Birds of the World. African Zosterops species are primarily continental or island-restricted, adapted to a range of and habitats. The Abyssinian white-eye (Zosterops abyssinicus) occurs in the and extends southward to northern , where it inhabits montane s and gardens; it is assessed as Least Concern by the IUCN due to its stable population. The Cape white-eye (Zosterops virens) is widespread in , from to southern , favoring , scrub, and suburban areas; it holds Least Concern status, though local populations face habitat pressures. The white-eye (Zosterops pallidus), a range-restricted endemic to arid savannas along the in and , was recently split from Z. virens and is classified as Least Concern, with no significant threats identified. In , the exhibits exceptional diversity, particularly in island archipelagos, with many showing rapid evolutionary divergence. The Japanese white-eye, now known as the (Zosterops japonicus), is native to including , Korea, and parts of and , but has over 20 and has been introduced to , , and parts of the , where it thrives in diverse habitats; it is rated Least Concern globally. The black-capped white-eye (Zosterops atricapilla) inhabits montane forests of the , , and , noted for its distinctive dark head; this polytypic is Least Concern but vulnerable to in some areas. Pacific Zosterops species often represent "great speciator" radiations on oceanic islands, with high levels of . The silvereye (Zosterops lateralis) is native to eastern , New Guinea, and numerous Pacific islands including , where it occupies forests, woodlands, and urban edges; it is Least Concern and has expanded via natural and introduced means across its range. The Vanikoro white-eye (Zosterops gibbsi) is restricted to the remote , specifically , in lowland forests; as a monotypic species, it is considered Least Concern due to its stable population despite small range size. Other Pacific examples include the Fiji white-eye (Zosterops explorator), endemic to 's forests and gardens, Least Concern despite pressures.

Extinct Species

Three species of the genus Zosterops have become extinct since human arrival, all endemic to small oceanic islands where they were highly vulnerable to anthropogenic impacts. These losses underscore the fragility of insular populations, which often lack the genetic diversity and ecological resilience of mainland counterparts. The Marianne white-eye (Z. semiflavus) was endemic to Marianne Island in the Seychelles, where it inhabited forested habitats. Known only from limited 19th-century specimens, it likely disappeared before 1900 due to extensive deforestation for agriculture and plantations, compounded by predation from introduced rats (Rattus spp.) and competition from invasive bird species such as the Madagascar fody (Foudia madagascariensis). The robust white-eye (Z. strenuus) occurred exclusively on , , in lowland forests and gardens. Common until 1918, its rapid decline followed the introduction of black rats (Rattus rattus) via a shipwreck that year; the rats preyed heavily on eggs, nestlings, and adults, leading to by the 1920s. Habitat modification from also contributed. The white-chested white-eye (Z. albogularis) was restricted to Norfolk Island, Australia, favoring mature native forests. Abundant in the early 20th century, it suffered from ongoing habitat clearance for agriculture and grazing, as well as predation by introduced black rats that arrived around 1943. The last confirmed multi-observer sightings occurred in 1979, after which it was declared extinct (IUCN 2024), though unconfirmed reports persisted into the 1980s. These extinctions highlight the extreme vulnerability of Zosterops populations on isolated islands to introduced predators and alteration, often resulting in swift local collapses. Subfossil evidence from Pacific islands indicates that may have had broader prehistoric distributions before human-mediated changes fragmented their ranges.

References

  1. https://birdsoftheworld.org/bow/species/zoster2/cur/introduction
  2. https://pmc.ncbi.nlm.nih.gov/articles/PMC7775107/
  3. https://fatbirder.com/ornithology/zosteropidae-white-eyes-yuhinas-and-allies/
  4. https://www.sciencedirect.com/science/article/abs/pii/S1055790320301159
  5. https://www.merriam-webster.com/dictionary/Zosterops
  6. https://en.wiktionary.org/wiki/Zosterops
  7. https://biodiversity.org.au/afd/taxa/Zosterops
  8. https://doi.org/10.1016/j.ympev.2021.107273
  9. https://doi.org/10.1007/s10336-018-1583-7
  10. https://doi.org/10.1371/journal.pone.0181441
  11. https://doi.org/10.7554/eLife.62765
  12. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0181441
  13. https://www.orientalbirdclub.org/s/Rasmussen-White-eye.pdf
  14. https://www.sciencedirect.com/science/article/abs/pii/S1055790315002493
  15. https://www.novogene.com/us-en/wp-content/uploads/sites/4/2023/10/The-dynamics-of-hybridisation-between-an-avian-island-endemic-and-a-recent-coloniser.pdf
  16. https://datazone.birdlife.org/species/factsheet/solomons-white-eye-zosterops-kulambangrae
  17. https://datazone.birdlife.org/species/factsheet/white-chested-white-eye-zosterops-albogularis
  18. https://datazone.birdlife.org/species/factsheet/bridled-white-eye-zosterops-conspicillatus
  19. https://datazone.birdlife.org/species/factsheet/marianne-white-eye-zosterops-semiflavus
  20. https://www.iucnredlist.org/species/22714032/22714043
  21. https://onlinelibrary.wiley.com/doi/abs/10.1111/ibi.13309
  22. https://www.researchgate.net/publication/352917201_DNA_Barcode_of_Black_Capped_White_Eye_Zosterops_atricapilla_Aves_Zosteropidae_From_Bengkulu_Indonesia_Based_on_Mitochondrial_DNA_COI_Gene
  23. https://doi.org/10.2173/bow.zoster2.01
  24. https://repository.naturalis.nl/pub/317693/ZV1969102001.pdf
  25. https://bioone.org/journals/the-wilson-journal-of-ornithology/volume-120/issue-1/06-051.1/A-New-White-Eye-Zosterops-from-the-Togian-Islands-Sulawesi/10.1676/06-051.1.short
  26. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/zosterops
  27. https://animaldiversity.org/accounts/Zosterops_pallidus/
  28. https://birdsoftheworld.org/bow/species/silver3/cur/introduction
  29. https://birdsoftheworld.org/bow/species/capwhe6/cur/introduction
  30. https://royalsocietypublishing.org/doi/10.1098/rstb.2009.0281
  31. https://birdsoftheworld.org/bow/species/warwhe1/cur/appearance
  32. https://birdsoftheworld.org/bow/species/bhweye1/cur/introduction
  33. https://www.pnas.org/doi/10.1073/pnas.0809861105
  34. https://elifesciences.org/articles/62765
  35. https://www.researchgate.net/publication/378682126_On_the_brink_of_explosion_Identifying_the_source_and_potential_spread_of_introduced_Zosterops_white-eyes_in_North_America
  36. https://www.audubon.org/magazine/non-native-songbird-taking-over-california-will-rest-country-be-next
  37. https://www.researchgate.net/publication/236856727_Family_Zosteropidae_White-eyes
  38. https://datazone.birdlife.org/species/factsheet/robust-white-eye-zosterops-strenuus
  39. https://www.artsandacademic.net/pdf/white-eye.PDF
  40. https://birdsoftheworld.org/bow/species/warwhe1/cur/habitat
  41. https://www.riverbanks.org/subsite/pact/whiteeyes.pdf
  42. https://birdsoftheworld.org/bow/species/heuwhe2/cur/habitat
  43. https://app.mybirdbuddy.com/birds/ethiopian-white-eye/f3d0c3f8-9423-4c53-bc4b-898a1eee8b93
  44. https://www.researchgate.net/publication/232029681_Habitat_use_and_feeding_ecology_of_Kulal_White-eye_Zosterops_kulalensis
  45. https://www.sciencedirect.com/science/article/abs/pii/S105579031200200X
  46. https://earthlife.net/indonesian-white-eyes/
  47. https://pdfs.semanticscholar.org/edd6/bdb374450811f6a54eeed7aaf0cd2d8aa797.pdf
  48. https://birdsoftheworld.org/bow/species/warwhe1/cur/foodhabits
  49. https://birdsoftheworld.org/bow/species/yebwhe1/cur/introduction
  50. https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=22016&context=auk
  51. https://birdsoftheworld.org/bow/species/indwhe1/cur/foodhabits
  52. https://www.cambridge.org/core/services/aop-cambridge-core/content/view/554EBA44DA5A2969BE57F9D457C61FC9/S0959270904000024a.pdf/habitat_use_and_feeding_ecology_of_kulal_whiteeye_zosterops_kulalensis.pdf
  53. https://link.springer.com/article/10.1007/BF02347191
  54. https://birdsoftheworld.org/bow/species/warwhe1/cur/breeding
  55. https://birdsoftheworld.org/bow/species/capwhe2/cur/introduction
  56. https://birdsoftheworld.org/bow/species/maswhe3/cur/introduction
  57. https://www.researchgate.net/publication/250071605_Breeding_biology_of_the_endangered_Rota_Bridled_White-eye
  58. https://scholarspace.manoa.hawaii.edu/server/api/core/bitstreams/21e02b58-af5e-449d-b95e-c573dd099aec/content
  59. https://genomics.senescence.info/species/entry.php?species=Zosterops_lateralis
  60. https://birdsoftheworld.org/bow/species/warwhe1/cur/demography
  61. https://birdsoftheworld.org/bow/species/warwhe1/cur/sounds
  62. https://www.jstage.jst.go.jp/article/jjo1915/16/77/16_77_315/_article/-char/en
  63. https://academic.oup.com/beheco/article/24/6/1363/189849
  64. https://birdsoftheworld.org/bow/species/warwhe1/cur/behavior
  65. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1474-919X.1961.tb02455.x
  66. https://academic.oup.com/beheco/article/12/6/666/462591
  67. https://www.persee.fr/doc/revec_0249-7395_2012_num_67_2_1636
  68. https://www.sciencedirect.com/science/article/pii/S0960982209016200
  69. https://datazone.birdlife.org/species/factsheet/sangihe-white-eye-zosterops-nehrkorni
  70. https://datazone.birdlife.org/species/factsheet/gizo-white-eye-zosterops-luteirostris
  71. https://www.cambridge.org/core/journals/bird-conservation-international/article/evidence-of-steep-declines-in-the-heavily-traded-javan-whiteeye-zosterops-flavus-from-repeated-standardised-surveys/77C84BB1369CC1A2AA59EA04B9A7429D
  72. https://datazone.birdlife.org/species/factsheet/wangi-wangi-white-eye-zosterops-paruhbesar
  73. https://earthlife.net/africanyellowwhiteeyes/
  74. https://app.mybirdbuddy.com/birds/madagascar-white-eye/915798c2-f82f-4484-9c7a-c080d71cf1b9
  75. https://www.environment.nsw.gov.au/sites/default/files/2024-09/zosterops-lateralis-tephropleurus-preliminary-determination.pdf
  76. https://edit.doi.gov/sites/doi.gov/files/uploads/pac_regional_biosecurity_plan_for_micronesia_and_hawaii_volume_i.pdf
  77. https://www.environment.nsw.gov.au/sites/default/files/2024-09/zosterops-lateralis-tephropleurus-conservation-assessment.pdf
  78. https://academic.oup.com/gbe/article/7/9/2680/592400
  79. https://www.cpsg.org/documents/conservation-plan-mauritius-olive-white-eye
  80. https://www.researchgate.net/publication/279200675_Conservation_Introduction_of_the_Bridled_White-eye_Zosterops_conspicillatus_saypani_from_the_Island_of_Saipan_to_the_Island_of_Sarigan_Commonwealth_of_the_Northern_Mariana_Islands
  81. https://datazone.birdlife.org/species/factsheet/saipan-white-eye-zosterops-saypani
  82. https://files.stlzoo.org/production/documents/WildCare-Institute/Pacific-Islands-Impact-241986.pdf?dm=1732567212
  83. https://cites.org/eng/taxonomy/term/2789
  84. https://www.researchgate.net/publication/362359107_On_the_edge_habitat_restoration_priorities_for_three_Critically_Endangered_bird_species_on_Sangihe_Indonesia
  85. https://link.springer.com/article/10.1007/s10336-018-1583-7
  86. https://datazone.birdlife.org/species/factsheet/cape-white-eye-zosterops-virens
  87. https://datazone.birdlife.org/species/factsheet/orange-river-white-eye-zosterops-pallidus
  88. https://datazone.birdlife.org/species/factsheet/black-capped-white-eye-zosterops-atricapilla
  89. https://datazone.birdlife.org/species/factsheet/silvereye-zosterops-lateralis
  90. https://datazone.birdlife.org/species/factsheet/vanikoro-white-eye-zosterops-gibbsi
  91. https://birdsoftheworld.org/bow/species/marwhe1/cur/introduction
  92. https://invasives.org.au/our-work/ending-extinctions/white-chested-white-eye/
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