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Great tinamou
Great tinamou
Great tinamou
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Great tinamou
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Infraclass: Palaeognathae
Order: Tinamiformes
Family: Tinamidae
Genus: Tinamus
Species:
T. major
Binomial name
Tinamus major
(Gmelin, JF, 1789)
Subspecies[2]

See text

Synonyms

The great tinamou (Tinamus major) is a species of tinamou ground bird native to Central and South America. There are several subspecies, mostly differentiated by their coloration.

Taxonomy

[edit]

The great tinamou was described and illustrated in 1648 by the German naturalist Georg Marcgrave in his Historia Naturalis Brasiliae. Marcgrave used the name Macucagua.[4] The French polymath Georges-Louis Leclerc, Comte de Buffon described and illustrated the great tinamou in 1778 in his Histoire Naturelle des Oiseaux from specimens collected in Cayenne, French Guiana. He simplified Marcgrave's name to Magoua.[5] When in 1788 the German naturalist Johann Friedrich Gmelin revised and expanded Carl Linnaeus's Systema Naturae, he included the great tinamou and placed it with all the grouse like birds in the genus Tetrao. He coined the binomial name Tetrao major and cited the earlier authors.[6] The great tinamou is now placed with four other species in the genus Tinamus that was introduced in 1783 by the French naturalist Johann Hermann.[7][8] Hermann based his name on "Les Tinamous" used by Buffon. The word "Tinamú" in the Carib language of French Guiana was used for the tinamous.[9][10]

All tinamous are from the family Tinamidae, and are the closest living relatives of the ratites. Unlike ratites, tinamous can fly, although in general, they are not strong fliers. All ratites evolved from prehistoric flying birds.[11]

Twelve subspecies are recognised:[8]

  • T. m. robustus Sclater, PL & Salvin, 1868 – southeast Mexico, Guatemala and Honduras
  • T. m. percautus Van Tyne, 1935 – south Mexico, north Guatemala and Belize
  • T. m. fuscipennis Salvadori, 1895 – north Nicaragua to west Panama
  • T. m. brunneiventris Aldrich, 1937 – south-central Panama
  • T. m. castaneiceps Salvadori, 1895 – southwest Costa Rica and west Panama
  • T. m. saturatus Griscom, 1929 – east Panama and northwest Colombia
  • T. m. zuliensis Osgood & Conover, 1922 – northeast Colombia and north Venezuela
  • T. m. latifrons Salvadori, 1895 – southwest Colombia and west Ecuador
  • T. m. major (Gmelin, JF, 1789) – east Venezuela to northeast Brazil
  • T. m. serratus (Spix, 1825) – northwest Brazil
  • T. m. olivascens Conover, 1937 – Amazonian Brazil
  • T. m. peruvianus Bonaparte, 1856 – southeast Colombia to Bolivia and west Brazil

Description

[edit]

The great tinamou is a large species of tinamou, measuring in total length at approximately 38 to 46 cm (15 to 18 in), with a mean of 44 cm (17 in), and weighing from 700 to 1,142 g (1.543 to 2.518 lb) in males, with a mean of 960 g (2.12 lb), and from 945 to 1,249 g (2.083 to 2.754 lb) in females, with a mean of 1,097 g (2.418 lb). Despite its name and large size and shape, which may be suggestive of a large pheasant or a small turkey, it is not necessarily the largest species of tinamou, as it is rivaled or exceeded by other species in the Tinamus. It ranges from light to dark olive-green in color with a whitish throat and belly,[11][12][13][14] flanks barred black, and undertail cinnamon. Crown and neck rufous, occipital crest and supercilium blackish. Its legs are blue-grey in color. All these features enable great tinamou to be well-camouflaged in the rainforest understory.

The great tinamou has a distinctive call, three short, tremulous but powerful piping notes which can be heard in its rainforest habitat in the early evenings.[11]

Songs and calls
Listen to Great Tinamou on xeno-canto

The great tinamous has the highest percentage of skeletal muscle devoted to locomotion among all birds, with 56.9% of its total body weight (43.74% of its body weight is skeletal muscle devoted to flight), at the same time, its heart is the smallest of all birds, in relative comparison (0.19%).[15][16]

Habitat

[edit]

Great tinamou lives in subtropical and tropical forest such as rainforest, lowland evergreen forest, river-edge forest,[3] swamp forest and cloud forest at altitudes from 300 to 1,500 m (1,000–4,900 ft). Unlike some other tinamous, the great tinamou isn't as affected by forest fragmentation.[1] Its nest can be found at the base of a tree.

Breeding

[edit]
Eggs, Collection Museum Wiesbaden

The great tinamou is a polygynandrous species, and one that features exclusive male parental care. A female will mate with a male and lay an average of four eggs which he then incubates until hatching. He cares for the chicks for approximately 3 weeks before moving on to find another female. Meanwhile, the female has left clutches of eggs with other males. She may start nests with five or six males during each breeding season, leaving all parental care to the males. The breeding season is long, lasting from mid-winter to late summer. The eggs are large, shiny, and bright blue or violet in color, and the nests are usually rudimentary scrapings in the buttress roots of trees.[11]

Except during mating, when a pair stay together until the eggs are laid, great tinamous are solitary and roam the dark understory alone, seeking seeds, fruit, and small animals such as insects, spiders, frogs and small lizards in the leaf litter. They are especially fond of Lauraceae, annonaceae, myrtaceae, sapotaceae.[11]

Conservation

[edit]

This species is widespread throughout its large range (6,600,000 km2 (2,500,000 sq mi)),[17] and it is evaluated as Least Concern on the IUCN Red List of Threatened Species.[1] They are hunted with no major effect on their population.[11]

References

[edit]

Sources

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

Great tinamou

View on Grokipedia
from Grokipedia
The Great tinamou (Tinamus major) is a large, ground-dwelling in the Tinamidae, endemic to the Neotropical region of Central and , where it inhabits dense subtropical and tropical forests such as rainforests, lowland evergreen forests, and swamp forests at elevations up to 1,500 meters. Measuring 40–46 cm in length and weighing 700–1,249 grams, it features olive-brown plumage with black barring on the upperparts, a white throat, buff central belly, and blue-grey legs, providing effective on the . This non-migratory is primarily solitary except during breeding, foraging for fruits, seeds, and occasionally small , and is known for its explosive flight when disturbed and a characteristic tremulous, quavering vocalization often heard at dawn and dusk. Distributed across a vast range of approximately 11,900,000 km² from southern through to the in countries including , , , , , and , the Great tinamou comprises 12 recognized , each adapted to local forest environments. It prefers undisturbed primary forests but can occur in and plantations, though it avoids open areas. Behaviorally, it roosts in trees or vines at night and relies on its cryptic coloration to evade predators, with males taking primary responsibility for incubation of 3–6 glossy violet eggs in ground nests for about 17 days, followed by brooding the precocial chicks. Its diet consists mainly of berries and fruits from families like and (comprising up to 89% of intake in some studies), supplemented by , spiders, and small . Despite its wide distribution and population estimated at 5–50 million individuals, the Great tinamou faces threats from habitat deforestation and hunting for food, leading to an overall decreasing trend of 8–17% over recent and projected generations. Classified as Least Concern by the IUCN, it remains common in intact forest areas but is vulnerable in fragmented habitats. The ' polygynandrous and role as a disperser highlight its ecological importance in Neotropical ecosystems.

Taxonomy

Classification and etymology

The great tinamou (Tinamus major) was first described and illustrated in 1648 by the German naturalist Georg Marcgrave in his work Historia Naturalis Brasiliae, where it was referred to as "Macucagua." The species received its binomial nomenclature as Tinamus major in 1789, assigned by Johann Friedrich Gmelin in Systema Naturae, based primarily on Marcgrave's account and earlier descriptions by Mathurin Jacques Brisson. The name Tinamus derives from "tinamú," a term in the Galibi language (spoken in regions including , ) for these birds, reflecting indigenous for tinamous. The specific epithet major comes from Latin, meaning "larger" or "greater," denoting the species' status as one of the largest tinamous compared to others in the . In modern taxonomy, the great tinamou belongs to the order Tinamiformes, family Tinamidae, and Tinamus, within the superorder , which encompasses ratites and tinamous. Molecular and fossil evidence positions tinamous as the closest living relatives to ratites (such as emus and ostriches), forming a monophyletic clade of palaeognaths characterized by ancient avian traits like a palatal structure distinct from neognaths. The evolutionary lineage of tinamous diverged from that of other ratites approximately 62–71 million years ago during the early , following the Cretaceous-Paleogene , as supported by phylogenomic analyses of nuclear genes and fossil-calibrated molecular clocks. Unlike flightless ratites, tinamous retain the ability for short-distance flight, though they are predominantly terrestrial with reduced wing functionality adapted for burst escapes rather than sustained aerial travel.

Subspecies

The great tinamou (Tinamus major) is recognized as comprising 12 , primarily distinguished by variations in coloration, features, and subtle differences in body size. These exhibit a range of tones from olive-brown to more or hues on the upperparts and underparts, along with differences in barring patterns, the presence or extent of an occipital crest, and bill proportions. Recognition is based on these morphological traits, though some boundaries are debated due to clinal variation across geographic ranges, where traits gradually change rather than showing sharp discontinuities. Key subspecies include T. m. robustus, found in lowlands from southeastern Mexico (Veracruz and northern Oaxaca) to eastern Guatemala and northern Honduras, characterized by generally darker plumage tones compared to more northern forms. T. m. latifrons occurs in southwestern and western , notable for a relatively larger bill and paler overall coloration. Further south and east, T. m. peruvianus inhabits southeastern , eastern , northeastern , and extreme western , with paler underparts, a fawn or cinnamon-brown head, and a gray collar accentuating duller brown upperparts that are heavily barred. In northern and adjacent areas, T. m. serratus (sometimes grouped with related forms) shows more pronounced barring on the flanks and a distinct crown without a prominent crest. Recent DNA analyses since 2010, including molecular phylogenies of the Tinamidae family, have largely confirmed the validity of these delineations within T. major by supporting species-level distinctions and revealing low levels of intergradation, while noting potential hybridization zones in areas of with closely related tinamous, though direct evidence for T. major remains limited.

Description

Physical characteristics

The great tinamou (Tinamus major) is the largest species in its , measuring 40–46 cm in length, with males weighing 700–1,142 g and females 945–1,249 g. It exhibits sexual in , though females are slightly larger than males. The overall body form is stout and robust, resembling a small , adapted for a primarily terrestrial . The provides excellent in forest understory, featuring drab brown upperparts irregularly barred with blackish streaks. The throat and central belly are whitish, while the lower neck transitions to a buffier ground color on the breast; the flanks and thighs show coarser dark bars on a buff background. The crown is cinnamon-rufous with short blackish bars and a short occipital crest, the face is pale gray to buff peppered with dark brown, and the short tail is narrowly tipped buff with a weaker barring pattern than the upperparts. The upperwing-coverts are drab brown with bold blackish bars. Morphologically, the great tinamou has a small head with large eyes, a slender bill that is dark horn-gray (paler on the lower ) and slightly downcurved, short rounded wings suited for explosive bursts of flight rather than sustained aerial travel, and strong, gray to light grayish-blue legs with buffy rear scutellation enabling rapid running on the ground. Physiologically, it possesses well-developed supporting its locomotor demands, though exact proportions vary among tinamous. The heart is notably small relative to body mass at 0.15–0.17%, which constrains aerobic capacity for prolonged flight and aligns with its preference for ground-dwelling and short-distance evasion.

Vocalizations

The primary vocalization of the Great tinamou (Tinamus major) is a distinctive three-note , commonly described as "oo-oo-oo" or "who-who-who," which serves as the ' most characteristic call. This call, produced by the , typically lasts about 2 seconds and exhibits a resonant, haunting quality that echoes through dense forest environments. Acoustically, it spans a range of 900–2,900 Hz, enabling it to carry over considerable distances in humid tropical lowlands, often forming part of dawn and choruses. This three-note whistle primarily functions in territorial advertisement by males and in attracting females, with calls becoming more frequent during the breeding season to proclaim . In addition to the advertising call, the Great tinamou produces alarm vocalizations consisting of sharp, high-pitched notes when threatened or disturbed, signaling agitation or danger. The eerie and ventriloquial nature of these calls, which can seem to originate from multiple directions, contributes to the bird's secretive reputation in . Over 150 recordings of Great tinamou vocalizations have been documented, primarily from field surveys in Central and South American forests, supporting bioacoustic studies for population monitoring and detection in remote habitats.

Distribution and habitat

Geographic range

The great tinamou (Tinamus major) occupies a broad expanse across the Neotropics, primarily in lowland forests from southeastern southward through and into northern . Its current range spans from , , , and in Mexico, through , , , , , and , extending into , , , , , (including the ), , , and . The extent of occurrence covers approximately 11,900,000 km². Twelve are recognized, differentiated primarily by variations and distributed across specific regions within the overall range. For instance, the subspecies T. m. robustus inhabits the northern limits from southeastern to northern , while T. m. peruvianus occurs in the Andean foothills from southeastern and eastern southward to northeastern and extreme western . Other subspecies, such as T. m. major in eastern , , and northeastern , further delineate the ' occupancy in eastern and Amazonian lowlands. In recent times, local populations have declined due to driven by , , and , as well as pressure. The species is non-migratory and generally sedentary, though individuals may undertake short local movements in response to seasonal food availability or disturbances within their territories.

Habitat preferences

The great tinamou (Tinamus major) primarily inhabits humid tropical and subtropical forests, including dense rainforests of both terra firme (non-flooded) and várzea (seasonally flooded) types, as well as swamp forests and montane cloud forests. It occurs from to elevations of up to 1,500 m, showing a clear preference for closed-canopy environments and avoidance of dry, open, or arid areas. Within these forests, the species associates with dense vegetation characterized by thick leaf litter layers, buttress-rooted , and tangled thickets, which provide cover for and nesting at tree bases or in secluded spots. It exhibits moderate tolerance for modified habitats, occupying secondary forests and even some plantations at densities comparable to primary forest, but it is sensitive to understory clearance and rarely ventures into cleared agricultural matrices or small fragments. Climatically, the great tinamou requires moist conditions with high humidity, annual rainfall ranging from 3,000 to 7,000 mm, and temperatures between 23°C and 29°C, aligning with the stable, wet microclimates of its preferred lowland and foothill forests.

Behavior and ecology

Diet and foraging

The Great tinamou exhibits an omnivorous diet dominated by plant matter, particularly fruits and seeds, with a smaller component of animal prey. In a detailed analysis of 17 individuals from , fruits constituted 89% of the diet by drained weight, derived from at least 38 plant species across multiple families including Myristicaceae, , , and , while animal items accounted for just 2%. Prominent fruit items included Virola surinamensis (25.1% of fruit intake), alongside seeds and nuts; animal prey consisted mainly of such as , beetles, and , earthworms, and woodlice. Occasional consumption of small vertebrates like and frogs has also been documented. Foraging occurs primarily on the , where the walks quietly in a solitary fashion, lowering its head to peck at fallen fruits, seeds, and amid leaf litter. It employs its bill to flip aside debris rather than using its feet to scratch the ground, allowing efficient access to without excessive disturbance. Average stomach contents weighed 18.4 g, reflecting moderate daily intake suited to its size and energy needs. Limited data suggest no pronounced seasonal shifts in diet composition, though availability may influence intake patterns across wet and dry periods in tropical forests. As a key , the great tinamou contributes to forest dynamics but primarily acts as a seed predator, with its crushing many ingested seeds rather than facilitating dispersal. Adaptations for processing a high-fiber, include a for temporary storage of ingested material and a robust muscular that utilizes ingested grit to grind tough seeds and other hard items, representing approximately 8% of the digestive tract's mass. This morphology enables efficient nutrient extraction from fibrous vegetation and occasional animal matter.

Daily activity and social structure

The great tinamou exhibits a diurnal activity pattern, primarily on the by walking quietly during daylight hours, with peaks in vocal activity and . At night, individuals roost on low branches or vines, resting on their tarsi pads to avoid detection. Great tinamous are generally solitary outside the breeding season, though pairs may form temporarily during mating, and loose associations of up to three to five individuals occasionally occur in non-breeding periods influenced by their polygynandrous . To evade predators such as ocelots, raptors, and snakes, great tinamous rely on provided by their barred brown , often freezing motionless when threatened to blend with the forest understory. If detected, they typically run swiftly to dense cover or, when startled, burst into short, explosive flights through the vegetation before dropping to the ground. Low-volume alarm calls, such as a whistled "woo hoo hoo," may be used sparingly to alert nearby individuals without drawing further attention. Territorial interactions among great tinamous involve vocal defense, with males using their resonant booming calls to proclaim and maintain territories, particularly during the breeding season. Aggression remains minimal outside breeding contexts, limited to occasional chases or displays toward intruders.

Reproduction

Mating system

The great tinamou exhibits a polygynandrous mating system, in which both males and females mate with multiple partners during the breeding season, with no long-term pair bonds formed. Females typically mate with several males, laying eggs in the nests of different individuals, while males may accept clutches from multiple females, leading to shared parental investment primarily by males. The adult sex ratio is approximately 1:1, though females display greater aggression during courtship interactions. Courtship is initiated and dominated by females, who approach potential mates and perform displays including neck elongation, tail raising, crouching, and feather fluffing to solicit copulation. Males often remain passive initially, observing before approaching, raising their tail, and mounting the female; copulations are brief, lasting 10-20 seconds. Females may vocalize with clucking sounds or soft-rolling songs during these displays, while males contribute three-note calls as part of territorial and attraction behaviors that overlap with contexts. Breeding occurs seasonally from mid-winter to late summer, with timing influenced by rainfall patterns that trigger increased resources and reproductive activity. Observations indicate peak and egg-laying from to May in Central American populations, aligning with the onset of wetter conditions.

Nesting and parental care

The great tinamou constructs its nest as a simple scrape on the ground, typically situated between the roots of large trees and concealed within leaf litter; no additional materials are added beyond a lining of large . Clutches consist of 2–12 eggs, though typically 3–6, laid by one or more females in the same nest. Females may lay eggs in multiple nests during the breeding season, associating with up to five or six males and potentially producing several clutches. The eggs are large, glossy, and colored intense greenish blue, , or violet, measuring approximately 58.5–62 mm in length and 51.5–53 mm in width, with a weight of 60–80 g. Recent observations highlight their luminous quality, which may enhance visibility in dim understories. Incubation begins only after the clutch is complete and lasts 17 days, maintained at temperatures around 34–35°C through the male's high nest attendance, which exceeds 99% of monitored time. Parental care is performed exclusively by the male, who incubates the eggs and broods after ; the abandons the nest immediately following laying. are precocial, covered in downy plumage (white, grey, or yellow) with dark spots, and capable of running shortly after . They remain under the male's protection, following him for about until becoming largely self-sufficient and fledging at 2–3 weeks of age. Breeding success is limited by high nest predation, primarily due to snakes and mammals targeting exposed ground nests.

Conservation

Population status

The Great tinamou (Tinamus major) is classified as Least Concern on the , with this assessment last updated in 2021, reflecting its extremely large geographic range that does not meet thresholds for higher threat categories. The global population is estimated at 5,000,000–49,999,999 mature individuals, derived from suspected values based on available data from 2016, though the quality of this estimate is rated as poor due to limited systematic surveys. In intact forests, population densities typically range from 1–3 individuals per km², as recorded in non-hunted Amazonian sites, providing a baseline for assessing carrying capacity. Overall, the population trend is decreasing, driven by ongoing habitat loss and hunting pressures, with an estimated past decline of 8–13% over three generations (approximately 20.94 years) from 2000 to 2012, and a projected future decline of 12–17% from 2016 to 2037. In hunted areas, such as parts of Costa Rica and the Amazon basin, local densities can drop by over 80% compared to unhunted sites, leading to population reductions of 30–50% in some fragmented landscapes. Stable populations persist in core areas like the Amazon basin, but local extirpations have occurred in heavily fragmented regions outside this extent. Monitoring efforts rely on tools like eBird data for distribution trends and camera traps for density estimates in remote forests, which have confirmed persistent presence in protected areas. remains high across the 12 recognized , supported by the ' wide Neotropical distribution and lack of evidence for significant in sampled s.

Threats and conservation measures

The great tinamou faces primary threats from habitat loss due to driven by , selective logging, road-building, and across its range. Tree cover within its distribution has declined by 8% over the past three generations (2001-2019), with projections indicating a further 12% loss from 2016 to 2039. as a prized for subsistence and local consumption exacerbates these pressures, potentially contributing an additional 5% to declines over three generations. Secondary threats include increased vulnerability from road infrastructure, which facilitates access for hunters and further fragments habitats, as well as predation in altered landscapes. Impact assessments reveal ongoing population declines of 8-13% over the past three generations, with future estimates at 12-17%, though the remains classified as Least Concern globally due to its large overall range and exceeding 5 million mature individuals. In fragmented habitats, great tinamous exhibit heightened vulnerability, with studies on large neotropical ground birds showing significant negative responses to patches smaller than those supporting viable populations, leading to localized reductions. These threats have resulted in no widespread but underscore risks in isolated remnants, particularly where pressure intensifies. Conservation measures include protection within several reserves, such as the Central Suriname Nature Reserve, where the species occurs and benefits from enforced habitat safeguards. In Ecuador's , long-term monitoring has documented great tinamou presence amid broader biodiversity protection efforts, highlighting the role of intact protected areas in mitigating declines. Hunting regulations are in place across key range countries; for instance, has prohibited hunting since 1967 under Federal Law No. 5,197, though enforcement challenges persist for subsistence practices, while implements similar restrictions within protected zones to curb illegal harvest. Community-based education programs, such as wildlife clubs in Guyana's region, promote sustainable practices and awareness to reduce hunting impacts. Post-2020 research initiatives have focused on sustainable modeling, including studies using audio recordings and camera traps to assess effects in Peruvian Amazon sites, informing . Future outlooks indicate that could further alter habitats through intensified droughts and floods, potentially shifting distributions and increasing vulnerability for subspecies like the robustus form in southern ranges, necessitating expanded monitoring and networks.

References

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  2. https://datazone.birdlife.org/species/factsheet/great-tinamou-tinamus-major
  3. https://animalia.bio/great-tinamou
  4. https://americanornithology.org/wp-content/uploads/2019/07/AOSChecklistTin-Falcon.pdf
  5. https://www.avesdecostarica.org/uploads/7/0/1/0/70104897/scientific-bird-names.pdf
  6. https://avibase.bsc-eoc.org/species.jsp?avibaseid=EBA3A919
  7. https://pmc.ncbi.nlm.nih.gov/articles/PMC2533212/
  8. https://www.sciencedirect.com/science/article/pii/S0960982216312143
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  11. https://doi.org/10.2173/bow.gretin1.01
  12. https://pmc.ncbi.nlm.nih.gov/articles/PMC5698454/
  13. https://www.birdnote.org/podcasts/birdnote-daily/great-tinamou-eerie-voice-jungle
  14. https://birdsofcolombia.com/pages/great-tinamou
  15. https://pmc.ncbi.nlm.nih.gov/articles/PMC8495786/
  16. https://www.britannica.com/animal/great-tinamou
  17. https://xeno-canto.org/species/Tinamus-major
  18. https://planetofbirds.com/tinamiformes-tinamidae-great-tinamou-tinamus-major/
  19. https://eprints.gla.ac.uk/168647/1/168647.pdf
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  31. https://dwazoo.com/animal/great-tinamou/
  32. https://www.discoverwildlife.com/animal-facts/birds/great-tinamou-mating-reproduction
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  34. https://ijpsjournal.org/index.php/ijps/article/view/1830
  35. https://www.jstor.org/stable/1943045
  36. https://ebird.org/species/gretin1
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