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Moorhen
Moorhen
Moorhen
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Not to be confused with Moorfowl or Moorcock.
"Gallinule" redirects here. For the blue gallinules, see Porphyrio.
For the American sailboat design, see Marsh Hen. For the South Carolina company, see Marsh Hen Mill.
For the video game series, see Crazy Chicken.

Moorhens
Temporal range: Late Oligocene to recent
Dusky moorhen, Gallinula tenebrosa
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Gruiformes
Family: Rallidae
Genus: Gallinula
Brisson, 1760
Type species
Fulica chloropus
Linnaeus, 1758
Species

see text

Synonyms

Edithornis
Pareudiastes

Moorhens—sometimes called marsh hens—are medium-sized water birds that are members of the rail family (Rallidae). Most species are placed in the genus Gallinula, Latin for "little hen."[1] They are close relatives of coots. They are often referred to as (black) gallinules. Recently, one of the species of Gallinula was found to have enough differences to form a new genus Paragallinula with the only species being the lesser moorhen (Paragallinula angulata).

Two species from the Australian region, sometimes separated in Tribonyx, are called "native hens" (also native-hen or nativehen).[2][3][4][5] The native hens differ visually by shorter, thicker and stubbier toes and bills, and longer tails that lack the white signal pattern of typical moorhens.[6][7]

Description

[edit]
Common moorhens fighting

These rails are mostly brown and black with some white markings in plumage color. Unlike many of the rails, they are usually easy to see because they feed in open water margins rather than hidden in reedbeds.

They have short rounded wings and are weak fliers, although usually capable of covering long distances. The common moorhen in particular migrates up to 2,000 km (1,200 mi) from some of its breeding areas in the colder parts of Siberia. Those that migrate do so at night. The Gough moorhen on the other hand is considered almost flightless; it can only flutter some metres. As is common in rails, there has been a marked tendency to evolve flightlessness in island populations.

Moorhens can walk very well on their strong legs, and have long toes that are well adapted to soft uneven surfaces.

These birds are omnivorous, consuming plant material, small rodents, amphibians and eggs. They are aggressively territorial during the breeding season, but are otherwise often found in sizeable flocks on the shallow vegetated lakes they prefer.

Systematics and evolution

[edit]
Flightless Tasmanian native hen, Tribonyx mortierii

The genus Gallinula was introduced by the French zoologist Mathurin Jacques Brisson in 1760 with the common moorhen (Gallinula chloropus) as the type species.[8][9]

The genus Gallinula contains five extant, one recently extinct, and one possibly extinct species:[10]

  • Samoan moorhen, Gallinula pacifica – sometimes placed in Pareudiastes, possibly extinct (1907?)
  • Makira moorhen, Gallinula silvestris – sometimes placed in Pareudiastes or Edithornis, extremely rare with no direct observations in recent decades, but still considered likely extant due to reports of the species persisting in very small numbers.
  • †Tristan moorhen, Gallinula nesiotis – formerly sometimes placed in Porphyriornis;[11] extinct (late 19th century)
  • Gough moorhen, Gallinula comeri – formerly sometimes placed in Porphyriornis
  • Common moorhen, Gallinula chloropus
  • Common gallinule, Gallinula (chloropus) galeata, recently split by the AOU, other committees still evaluating
  • Dusky moorhen, Gallinula tenebrosa

Former members of the genus:

Other moorhens have been described from older remains. Apart from the 1–3 extinctions in more recent times, another 1–4 species have gone extinct as a consequence of early human settlement: Hodgen's waterhen (Gallinula hodgenorum) of New Zealand—which belongs in subgenus Tribonyx—and a species close to the Samoan moorhen from Buka, Solomon Islands, which is almost certainly distinct from the Makira moorhen, as the latter cannot fly. The undescribed Viti Levu gallinule of Fiji would either be separated in Pareudiastes if that genus is considered valid, or may be a completely new genus. Similarly, the undescribed "swamphen" of Mangaia, currently tentatively assigned to Porphyrio, may belong to Gallinula/Pareudiastes.

Evolution

[edit]
Badge of HMS Moorhen

Still older fossils document the genus since the Late Oligocene onwards. The genus seems to have originated in the Southern Hemisphere, in the general region of Australia. By the Pliocene, it was probably distributed worldwide:

  • Gallinula sp. (Early Pliocene of Hungary and Germany)
  • Gallinula kansarum (Late Pliocene of Kansas, USA)
  • Gallinula balcanica (Late Pliocene[12] of Varshets, Bulgaria).[13]
  • Gallinula gigantea (Early Pleistocene of Czech Republic and Israel)

The ancient "Gallinula" disneyi (Late Oligocene—Early Miocene of Riversleigh, Australia) has been separated as genus Australlus.

Even among non-Passeriformes, this genus has a long documented existence. Consequently, some unassigned fragmentary rail fossils might also be from moorhens or native hens. For example, specimen QM F30696, a left distal tibiotarsus piece from the Oligo-Miocene boundary at Riversleigh, is similar to but differs in details from "G." disneyi.[6] It cannot be said if this bird—if a distinct species—was flightless. From size alone, it might have been an ancestor of G. mortierii (see also below).

In addition to paleosubspecies of Gallinula chloropus, the doubtfully distinct Late Pliocene to Pleistocene Gallinula mortierii reperta was described, referring to the population of the Tasmanian native hen that once inhabited mainland Australia and became extinct at the end of the last ice age.[14] It may be that apart from climate change it was driven to extinction by the introduction of the dingo, which as opposed to the marsupial predators hunted during the day, but this would require a survival of mainland Gallinula mortierii to as late as about 1500 BC.[15]

"G." disneyi was yet another flightless native hen, indicative of that group's rather basal position among moorhens. Its time and place of occurrence suggest it as an ancestor of G. mortierii (reperta), from which it differed mostly in its much smaller size. However, some limb bone proportions are also strikingly different, and in any case such a scenario would require a flightless bird to change but little during some 20 million years in an environment rich in predators. As the fossils of G. disneyi as well as the rich recent and subfossil material of G. mortierii shows no evidence of such a change at all, "G." disneyi more probably represents a case of parallel evolution at an earlier date,[6] as signified by its placement in Australlus.

References

[edit]

Further reading

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

Moorhen

View on Grokipedia
from Grokipedia
The (Gallinula chloropus), also known as the Eurasian moorhen, is a medium-sized in the rail family (Rallidae), distinguished by its predominantly dark gray to black plumage, white undertail coverts, a bright red frontal shield on the forehead, a yellow bill tipped with red, and yellow-green legs. This widespread species measures 30–35 cm in length with a wingspan of 50–60 cm and weighs 200–400 g, exhibiting sexual dimorphism only in size, with males slightly larger than females. It inhabits a variety of freshwater and brackish wetlands, including marshes, ponds, lakes, rivers, canals, and rice fields, preferring areas with dense emergent vegetation for cover and foraging, from sea level up to elevations of 4,400 m. Native to a vast global range spanning , , and , with introduced populations in , the has an estimated extent of occurrence exceeding 143 million km² and a global population of 9–13.5 million mature individuals (as of 2021), though it shows an overall decreasing trend due to habitat loss and events. The is largely sedentary in warmer regions but partially migratory in northern areas, with birds moving to milder climates during winter; it avoids polar regions and dense tropical rainforests but adapts well to urban parks and agricultural wetlands. Behaviorally, moorhens are agile swimmers that bob their heads while moving on , capable of diving for and climbing through reeds or even low branches for roosting; on land, they walk with a jerky and are highly territorial, using vocalizations and aggressive displays to defend nesting areas. Their diet is omnivorous and opportunistic, consisting of aquatic plants, seeds, fruits, , small , amphibians, and mollusks, often gleaned from surfaces or . Breeding occurs in solitary pairs year-round in tropical zones or seasonally (March–August in temperate areas), with nests built from reeds in shallow ; clutches of 5–12 eggs are incubated for 19–22 days by both parents, and the precocial chicks after about 40–50 days, though high predation leads to low juvenile survival rates. Classified as Least Concern on the due to its large range and population, the faces localized threats including drainage, invasive predators like the , disease outbreaks such as and , and extreme winters, with some subspecies such as the Mariana common moorhen in facing endangerment. Conservation efforts focus on habitat protection in key areas, supporting its resilience as an adaptable often seen in garden ponds and nature reserves.

Taxonomy and evolution

Classification and etymology

The , scientifically named Gallinula chloropus, belongs to the rail family Rallidae within the order and is placed in the genus Gallinula. This binomial name was first established by in his 1758 work , where he described the species based on European specimens. The English common name "moorhen" dates back to at least the 13th century, derived from "mere" (meaning marsh or moor) to reflect the bird's preferred habitats, combined with "hen" for its plump, chicken-like body and . The specific chloropus originates from "khloros" (green or yellow) and "pous" (foot), alluding to the bird's yellowish-green legs and feet. The genus name Gallinula comes from Latin "gallina" (hen or ), emphasizing the ' resemblance to a small domestic . Taxonomically, G. chloropus has undergone revisions, particularly regarding its relationship to the population formerly treated as conspecific. In 2011, the American Ornithologists' Union split the (G. chloropus) from the American (G. galeata), based on genetic, vocal, and differences, though some authorities continue to consider them or conspecific. This separation was further supported in the 2014 of the Birds of the World by del Hoyo and Collar.

Subspecies

The (Gallinula chloropus) is currently recognized as comprising five valid , though taxonomic treatments vary. The nominate , G. c. chloropus, occurs across , , and extends into southwestern . G. c. pyrrhorrhoa is restricted to , including and nearby Indian Ocean islands such as the , , and . G. c. meridionalis inhabits and isolated islands like , , and . G. c. orientalis ranges through , from the and eastward to the , Greater Sundas, and . The fifth, G. c. guami, is endemic to the , including and the . Morphological differences among these subspecies are subtle and often clinal, making field identification challenging without geographic . The nominate chloropus serves as the baseline, with dark slate-gray plumage, a red frontal shield and bill tipped in yellow, and white undertail-coverts. Pyrrhorrhoa differs notably in having buff rather than white undertail-coverts and slightly warmer plumage tones. Meridionalis is smaller overall, with slaty upperwing-coverts lacking an wash. Orientalis resembles meridionalis but features a larger and more prominent frontal shield, along with minor variations in bill color intensity. Guami is smaller in overall size with slight differences in coloration. These traits—such as variations in size (typically 28–36 cm in length across forms), shield shape, and plumage saturation—provide limited diagnostic value, with location remaining the primary identifier. Debates persist on the validity of these , particularly regarding the Asian (orientalis) and American (galeata) forms. Genetic analyses, including sequencing, have revealed deep divergences between and populations, with galeata forming a basal lineage distinct from Asian and European clades, supporting its elevation to full status (Gallinula galeata) rather than lumping it with orientalis. This split was formalized in major checklists around based on such evidence, though some earlier classifications retained galeata as a due to overlapping vocalizations and similarities. Within the , the distinctions among meridionalis, pyrrhorrhoa, and orientalis are also questioned for potential clinal variation rather than discrete boundaries, prompting calls for further genomic studies to refine boundaries.

Evolutionary history

The moorhen lineage (genus Gallinula) originated during the , approximately 1.8–2.6 million years ago, as evidenced by fossil remains from the Dursunlu lignite mine in , . These fossils represent an undescribed form of Gallinula that exhibits morphological similarities to the modern (G. chloropus), including comparable size, bill structure, and limb proportions, suggesting that key features of the species had already evolved by this period. This discovery indicates an early establishment of the lineage in Eurasian environments during a time of climatic fluctuations that favored the expansion of freshwater habitats. Within the rail family (Rallidae), the moorhen's evolutionary adaptations are emblematic of the broader radiation of gruiform birds into niches beginning in the Eocene. Specialized lobed toes, which expand like paddles to distribute weight and enhance propulsion during , represent a key innovation that allowed Gallinula ancestors to exploit aquatic opportunities while maintaining terrestrial mobility. This trait, combined with laterally compressed bodies and short wings suited for burst flight over , facilitated colonization of dense, vegetated marshes. Secretive behaviors, such as remaining hidden in reeds and emitting low, inconspicuous calls, evolved concurrently to minimize detection by aerial and terrestrial predators, contributing to the survival of rails in predator-rich ecosystems during Pleistocene shifts. Phylogenetically, Gallinula occupies a position within Rallidae as part of a sister to the genus Fulica, with their common ancestor diverging around 18 million years ago in the early based on mitochondrial genome analyses and fossil-calibrated molecular clocks. The radiation within Gallinula itself occurred more recently, with the (G. chloropus) diverging from other species, such as the (G. tenebrosa), approximately 0.6–1.5 million years ago during the . This timing aligns with glacial-interglacial cycles that promoted isolation and genetic differentiation across continental and island populations, as inferred from sequence data.

Description

Physical characteristics

The (Gallinula chloropus) measures 30–38 cm in length, with a of 50–62 cm and a body weight ranging from 192–500 g. It possesses a relatively stocky build, characterized by a small head, thin , short rounded wings, and a moderately long tail that aids in balance during movement across varied terrains. Distinctive anatomical features include a prominent frontal extending above the bill, which is also with a yellow tip in adults. The legs are long and yellow to greenish, supporting unwebbed, lobed toes that lack full but enable through and facilitate walking on soft or floating without sinking. White under-tail coverts are conspicuous, particularly when the bird is in flight or flicks its tail. Sexual dimorphism is minimal, with males averaging slightly larger in size than females, though both sexes share similar overall morphology. Juveniles differ notably in having duller, less vividly colored bills without the full red shield and exhibiting a more brownish tone to their compared to adults.

Plumage and variations

The adult possesses a sooty black body accented by browner upperparts, prominent broken white streaks along the flanks, and white lateral undertail coverts. The bill is with a yellow tip, complemented by an elliptical frontal shield on the . Non-breeding adults exhibit slightly duller overall due to wear, though the core coloration remains consistent. There are no significant sexual dimorphisms in adult , with males and females sharing identical color patterns. Juveniles display a distinctly browner plumage than adults, often with a paler face, duller white flank streaks, and less vibrant bare parts, including a darker bill lacking the full red shield. This juvenile phase transitions to adult coloration through a partial postjuvenile moult focused on body feathers, typically completing after 3–4 months, while retaining juvenile flight feathers longer. Geographic variations in plumage are subtle across . Tropical populations, such as the Guam subspecies (G. c. guami), appear darker overall compared to the nominate form. Other variants include slaty blue-gray upperwing coverts in the African G. c. meridionalis and buff-colored undertail coverts in the Madagascan G. c. pyrrhorrhoa, but these differences do not alter the ' general appearance markedly.

Distribution and habitat

Geographic range

The Eurasian moorhen (Gallinula chloropus) has a native range spanning much of the , from and across the and to , extending southward to , the central , , , the , , the , the Greater Sundas, the western Lesser Sundas, the , , , and the . Subspecies distributions vary across this expanse; for example, the nominate G. c. chloropus occupies the Palearctic and parts of the Oriental region, G. c. meridionalis the Afrotropics, while G. c. orientalis covers Southeast Asian islands. The species exhibits partial migratory behavior, particularly in northern populations, which move southward from September to December to warmer regions such as the Mediterranean, , Arabia, and southern China, returning northward from March to May to avoid freezing wetlands during winter. Southern populations remain largely sedentary year-round. Human-mediated introductions have facilitated range expansions beyond the native Old World distribution, including to parts of North America (such as coastal California, Arizona, , and the Atlantic and Gulf coasts), South America, New Zealand, various Caribbean islands, and Pacific islands like Hawaii. These introductions, often dating to the 19th and 20th centuries, have resulted in established populations in some areas, though others remain sporadic or vagrant.

Habitat preferences

The (Gallinula chloropus) primarily inhabits freshwater wetlands, including marshes, ponds, lakes, and slow-moving rivers or streams, where dense emergent vegetation provides essential cover and foraging opportunities. These birds show a strong preference for lowland aquatic environments with still or gently flowing water, often up to elevations of 4,575 m during migration in regions like . In urban and suburban settings, they frequently occupy parks, canals, and farm ponds surrounded by grassy margins or shrubs, demonstrating their ability to exploit human-modified landscapes. Within these habitats, moorhens favor microhabitats at the edges of bodies featuring emergent such as reeds, cattails, or lilies, which offer , nesting sites, and access to prey. Studies on ponds indicate that suitable sites typically have high coverage exceeding 61% and coverage around banks greater than 81%, along with year-round availability and perimeters between 301 and 1,000 m. Larger pond areas (1,000–50,000 ) adjacent to farmlands within 200 m further enhance quality by supporting diverse food resources. While highly adaptable, moorhens tolerate in marshes and coastal wetlands but generally avoid fast-flowing rivers or expansive open water bodies lacking vegetative cover. This selectivity underscores their in vegetated, sheltered aquatic zones across temperate and tropical regions.

Behaviour and ecology

Diet and foraging

The (Gallinula chloropus) is omnivorous, with a diet dominated by matter such as seeds, leaves, roots, aquatic vegetation, , grasses, and berries, supplemented by animal prey including , arthropods, snails, worms, small , and tadpoles. Studies of gizzard contents indicate that material typically comprises 93% of the diet by volume, with animal foods making up the remaining 7%. During the breeding season, there is a shift toward greater consumption of animal prey to meet elevated nutritional demands. Juveniles rely more heavily on protein-rich to support growth. Moorhens employ diverse techniques adapted to environments, including walking across floating aquatic plants like lilypads, dabbling or upending in shallow to reach submerged , and occasional brief dives propelled by their lobed toes. They also glean from surfaces while with a characteristic jerky motion, forage along edges and in dense , graze on wet grasslands, and peck at the ground on land like a . often occurs in family groups, where individuals use their feet to manipulate and hold items.

Breeding and reproduction

The (Gallinula chloropus) exhibits a breeding season that varies by latitude and . In temperate regions of the , such as , breeding typically begins in March and extends through July, with peak egg-laying from mid-March to mid-May and multiple broods possible per pair. In tropical and subtropical areas, including parts of and southern , breeding occurs year-round, often with seasonal peaks such as September to December in southern , facilitated by consistent food availability and mild conditions. Moorhens are primarily monogamous, forming stable pairs that defend during the breeding period, though occasional or communal breeding arrangements, such as or , occur in about 10-20% of groups, particularly where resources allow multiple females per . Nests are built as bulky platforms of reeds, stems, and aquatic vegetation, typically anchored in emergent plants over shallow water or in dense marginal cover to provide concealment and protection from predators; pairs may construct multiple nests per for replacement or subsequent . Clutch sizes average 5-8 eggs early in the , occasionally reaching up to 12, with smaller clutches of 5-7 eggs in later ; eggs are laid at intervals of 1-2 days and incubated by both parents for 19-22 days, during which males often take night shifts. Parental care is biparental, with both sexes sharing incubation and subsequent chick-feeding duties, primarily providing small and matter to the young. Chicks hatch semi-precocial and remain dependent on parents for assistance, fledging at 40-50 days but often staying with the family group longer to contribute to territory defense. Helpers, usually retained offspring from previous broods (predominantly females), assist in feeding and guarding subsequent chicks, enhancing overall in groups attempting second or third broods. Intraspecific is common, affecting up to 25-30% of nests, where non-territorial "floater" females lay eggs in host nests, reducing success for parasitized eggs to about 25% compared to 60% for non-parasitic ones.

Social behaviour and vocalizations

Moorhens exhibit seasonal variation in their , being highly territorial during the breeding season when pairs defend exclusive areas around nests and sites against intruders of the same species. This territoriality involves displays such as low postures with half-spread wings to intimidate rivals. Outside the breeding period, individuals become more gregarious, forming loose flocks in wetlands where they roost and move together, though without strong hierarchical bonds. is a notable aspect of their , with juveniles from earlier broods often remaining on the to assist parents in feeding and guarding subsequent chicks, enhancing overall in some populations. Vocalizations play a key role in moorhen communication, encompassing a range of calls for alarm, contact, and territorial purposes. The primary alarm call is a sharp, repeated "kik-kik" or "keck-keck," delivered loudly to signal threats and rally group members or deter predators. Contact notes include softer clucking or grunting sounds that maintain pair bonds and coordinate movements within flocks, often uttered while hidden in vegetation. During aggressive encounters or to reinforce territory defense, moorhens produce explosive squawks or yelps resembling screams, which can escalate into physical confrontations. Interspecific and intraspecific interactions frequently involve aggression to protect resources. Moorhens engage in chases, either on foot or by short flights, to repel rivals or other bird species encroaching on feeding or breeding areas, sometimes leading to fights with pecking and kicking using their feet. Occasional intraspecific occurs, where females lay eggs in neighboring nests, a strategy tolerated by hosts under certain conditions like high predation risk, allowing opportunistic reproduction without full .

Relationship with humans

In culture

The , particularly its Hawaiian subspecies known as the ʻalae ʻula (Gallinula chloropus sandvicensis), holds a prominent place in Native Hawaiian mythology as the bearer of to humanity. According to legend, the bird brought to people from the gods' home, scorching its forehead in the process and creating its characteristic red frontal shield; this tale underscores the moorhen's role as a cultural symbol of ingenuity and sacrifice. In Hawaiian tradition, the ʻalae ʻula was regarded as a , reflecting its deep integration into indigenous stories and spiritual beliefs. In British provincial naming traditions, the (Gallinula chloropus) is documented under numerous folk terms such as water hen, marsh hen, hen, and stank hen, which evoke its association with environments and secretive habits near moors and ponds. These names, recorded in 19th-century ornithological compilations, highlight the bird's cultural perception as a elusive inhabitant of hidden watery realms, though without attached superstitions or omens specific to the species. The moorhen features in modern as a relatable character representing and in natural settings. For instance, in Ami Blackwelder's The Moorhen Runt (2012), the story follows a undersized moorhen chick overcoming challenges in its home, aiming to teach young readers about resilience and . Similarly, Hazel Douglas's Baby Moorhen Makes a Splash! (2010) depicts the adventures of a young moorhen exploring ponds and streams, illustrated to engage children with the bird's playful behaviors. Other works, such as Maxine K. Brown's The Adventures of Mexi the Boat Dog: Mexi and the Moorhen (2022), portray the moorhen as a mischievous friend in narratives blending and animal worlds along waterways. Symbolically, the moorhen embodies adaptability and resourcefulness across cultures, thriving in varied habitats from remote marshes to urban parks, which mirrors themes of flexibility in the face of environmental change. In Hawaiian lore, this extends to its fiery symbolism, representing the transformative power of knowledge shared with communities.

As pests or game

The common moorhen is hunted as a game bird in parts of Europe, where it is recognized under the EU Birds Directive as one of 84 species for which sustainable hunting is permitted, subject to national regulations on seasons and methods. In the United Kingdom, moorhens may be legally shot from 1 September to 31 January (as of 2025), with no statutory bag limits but adherence to voluntary codes of practice that emphasize population sustainability and ethical harvesting. Although hunting pressure has declined, moorhens were historically targeted for food by rural communities in Britain and Ireland as a supplementary "poor man's game." In , common moorhens are hunted for food in various regions, including southern where they are consumed as "water chicken" in local cuisine, and in the where local populations face threats from hunting alongside habitat loss. Localized declines have been noted in areas such as due to hunting pressure. Moorhens are sometimes regarded as pests in human-modified environments, particularly in agricultural areas where they may damage crops, and in urban ponds and parks where their droppings can lead to issues or with for resources, prompting localized management efforts. Control methods, such as , have been evaluated for problem bird species including moorhens in areas like , where the related (Gallinula tenebrosa) occupies similar urban wetland niches and may overlap in nuisance contexts. Common moorhens often exhibit tame behavior in proximity to humans, particularly in parks and gardens where they frequent and become habituated to presence, allowing for close observations and occasional hand-feeding by visitors. This familiarity facilitates interactions but raises risks of transmission, as birds like moorhens can carry pathogens such as through contaminated feces or regurgitated food, potentially spreading to humans via direct contact or shared environments during feeding.

Conservation

Population status

The (Gallinula chloropus) is classified as Least Concern on the due to its extremely large range and population size, which spans over 143 million square kilometers across , , , and introduced regions. The global is estimated at 9,069,000 to 13,527,000 mature individuals, reflecting its widespread distribution and adaptability to varied habitats. Overall, the trend is suspected to be decreasing slightly, though it remains stable in most parts of its range, with no severe fragmentation observed. Regionally, populations show variation; in the , breeding numbers have declined by 25% from 1995 to 2024, with a 10-year trend of -12% (2014–2024), reaching low levels, while wintering populations have decreased, leading to an amber conservation status. In contrast, populations appear stable across much of and , where the species benefits from extensive suitable habitats and lower monitoring intensity compared to . Isolated island populations, such as in , are critically small, with fewer than 100 individuals recorded in recent surveys, highlighting vulnerability to local stochastic events despite the species' global security. Monitoring efforts by BirdLife International and national organizations, including the British Trust for Ornithology's long-term censuses, provide key data on these trends, revealing that the moorhen's ability to adapt to urban wetlands has helped buffer declines in human-modified landscapes.

Threats and protection

The common moorhen faces several major threats across its range, primarily stemming from anthropogenic activities that degrade its wetland habitats. Wetland drainage for agriculture and urban development has led to significant habitat loss, particularly in regions like Europe and North America, where conversion of marshes and ponds reduces available breeding and foraging sites. Pollution from agricultural runoff and industrial contaminants further exacerbates this by contaminating water bodies, affecting food availability and causing bioaccumulation of toxins in the birds. Climate change contributes through induced drying of wetlands via altered precipitation patterns and increased evaporation, which diminishes suitable aquatic environments, especially in Mediterranean and tropical regions. Hunting pressure represents another localized threat, particularly in parts of and where the species is legally harvested during certain seasons, potentially impacting population stability in heavily targeted areas. On islands, competition from poses risks; for instance, introduced predators and competitors have contributed to declines in insular populations by preying on eggs and chicks or outcompeting for resources. Certain subpopulations exhibit heightened vulnerabilities. The Mariana common moorhen (Gallinula chloropus guami), endemic to Pacific atolls, faces a high extinction risk due to ongoing habitat loss from development and typhoon damage, compounded by limited dispersal abilities that restrict recolonization. Conservation efforts aim to mitigate these threats through legal protections and habitat management. In the European Union, the common moorhen is listed under Annex II of the Birds Directive, affording it protection from unsustainable hunting and requiring member states to maintain favorable conservation status. Organizations like the Royal Society for the Protection of Birds (RSPB) undertake wetland restoration projects, such as creating scrapes and reedbeds, to enhance breeding habitats and counteract drainage impacts. The International Union for Conservation of Nature (IUCN), through BirdLife International, supports monitoring programs to track population trends, while targeted initiatives in the UK, including surveys by the British Trust for Ornithology (BTO), address localized declines by informing restoration priorities. For endangered subspecies like the Mariana common moorhen, the U.S. Fish and Wildlife Service implements recovery plans focused on habitat protection and predator control. These measures have helped stabilize some populations, though ongoing vigilance is needed amid broader environmental pressures.

References

  1. https://animaldiversity.org/accounts/Gallinula_chloropus/
  2. https://www.rspb.org.uk/birds-and-wildlife/moorhen
  3. https://datazone.birdlife.org/species/factsheet/common-moorhen-gallinula-chloropus
  4. https://www.fws.gov/species/mariana-common-gallinule-gallinula-chloropus-guami
  5. https://avibase.bsc-eoc.org/species.jsp?avibaseid=8F82FF8C30667D90
  6. https://www.museum.lsu.edu/~Remsen/SACCprop335.htm
  7. https://www.thainationalparks.com/species/common-moorhen
  8. https://scottishwildlifetrust.org.uk/species/moorhen-common/
  9. https://avibase.bsc-eoc.org/species.jsp?avibaseid=3EF081A8ED429A45
  10. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=176284
  11. https://www.museum.lsu.edu/~Remsen/SACCprop416.htm
  12. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0001835
  13. https://www.researchgate.net/publication/263497326_The_avifauna_of_Dursunlu_Turkey_Lower_Pleistocene_climate_environment_and_biogeography
  14. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0109635
  15. https://americanornithology.org/wp-content/uploads/2020/02/2010-A.pdf
  16. https://www.ebsco.com/research-starters/environmental-sciences/common-moorhen
  17. https://www.allaboutbirds.org/guide/Common_Gallinule/id
  18. https://www.audubon.org/field-guide/bird/common-gallinule
  19. https://portal.ct.gov/DEEP/Wildlife/Fact-Sheets/Common-Moorhen
  20. https://birdsoftheworld.org/bow/species/commoo3/cur/introduction
  21. http://blascozumeta.com/specie_files/04240_ENG_Gallinula_chloropus_aranzadi.pdf
  22. https://www.bto.org/learn/about-birds/birdfacts/moorhen
  23. https://nhpbs.org/natureworks/moorhen.htm
  24. https://doi.org/10.3390/su10051352
  25. https://seafwa.org/sites/default/files/journal-articles/MULHOLLAND-527-536.pdf
  26. https://www.researchgate.net/publication/277884602_Variation_in_the_diet_of_Common_Moorhen_Gallinula_chloropus_Aves_Rallidae_at_Lake_Reghaia_Algeria
  27. https://www.massaudubon.org/our-work/birds-wildlife/bird-conservation-research/breeding-bird-atlases/find-a-bird-bba1?id=52
  28. https://core.ac.uk/download/pdf/161880521.pdf
  29. https://www.biodiversityexplorer.info/birds/rallidae/gallinula_chloropus.htm
  30. https://link.springer.com/article/10.1007/bf00300863
  31. https://www.sciencedirect.com/science/article/abs/pii/S0003347287802221
  32. https://doi.org/10.2173/bow.comgal1.01
  33. https://link.springer.com/article/10.1007/BF00300863
  34. https://www.allaboutbirds.org/guide/Common_Gallinule/sounds
  35. http://jararaca.ufsm.br/websites/niltoncaceres/download/Wallau_galinula.pdf
  36. https://www.fws.gov/story/species-spotlight-hawaiian-moorhen-alae-ula
  37. https://dlnr.hawaii.gov/wildlife/birds/alae-ula/
  38. https://kaelepuluwetland.com/native-birds/hawaiian-gallinule/
  39. https://www.amazon.com/Moorhen-Runt-Ami-Blackwelder-ebook/dp/B008YIDSPE
  40. https://www.awesomebooks.com/book/9780956015662/baby-moorhen-makes-a-splash/used
  41. https://www.barnesandnoble.com/w/the-adventures-of-mexi-the-boat-dog-mexi-and-the-moorhen-maxine-k-brown/1142256444
  42. https://worldbirds.com/gallinule-symbolism/
  43. https://www.govisithawaii.com/2011/01/12/alea-ula-the-hawaiian-moorhen/
  44. https://www.thesportinglodge.com/pages/uk-game-shooting-seasons
  45. https://www.cdc.gov/salmonella/spread/index.html
  46. https://www.bto.org/sites/default/files/bto_jncc_rspb_breeding_bird_survey_report_2024.pdf
  47. https://seaworld.org/animals/facts/birds/common-moorhen/
  48. https://www.birdsinbulgaria.org/birds.php?l=en&semeystvo=18&vid=124&type=bird
  49. https://www.unep-aewa.org/sites/default/files/document/tc8_24_report_effects_climate_change_on_mwb_0.pdf
  50. https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=12763&context=condor
  51. https://academic.oup.com/condor/article-abstract/93/1/38/5185357
  52. https://esadocs.defenders-cci.org/ESAdocs/five_year_review/doc2537.pdf
  53. https://www.rspb.org.uk/helping-nature/what-we-do/protecting-species-and-habitats/projects/species-coastals-and-wetlands
  54. https://ecos.fws.gov/docs/five_year_review/doc4573.pdf
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