Kagu

Last updated

Contents

Kagu
Kagu 0A2A2595.jpg
CITES Appendix I (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Eurypygiformes
Family: Rhynochetidae
Genus: Rhynochetos
Species:
R. jubatus
Binomial name
Rhynochetos jubatus

The kagu or cagou (Rhynochetos jubatus) is a crested, long-legged, and bluish-grey bird endemic to the dense mountain forests of New Caledonia. It is the only surviving member of the genus Rhynochetos and the family Rhynochetidae, [3] although a second species has been described from the fossil record.

Measuring 55 cm (21+1⁄2 in) in length, it has pale grey plumage and bright red legs. Its 'nasal corns' are a unique feature not shared with any other bird. Almost flightless, it spends its time on or near the ground, where it hunts its invertebrate prey, and builds a nest of sticks on the forest floor. Both parents share incubation of a single egg, as well as rearing the chick. It has proven vulnerable to introduced predators and is threatened with extinction.

Etymology

Wood engraving of a pair, by F. J. Gauchard A pair of kagou birds (Rhinochaetus jubatus) with one displa Wellcome V0022346.jpg
Wood engraving of a pair, by F. J. Gauchard

The name kagu is derived from the Melanesian names for the species. [4] The species is variously known as the kavu or kagou in the Kanak languages, and as the cagou in French (also used as an alternative spelling in English). [5]

Taxonomy and systematics

The sunbittern, a possible closest relative from Central and South America Stavenn Eurypiga helias 00.jpg
The sunbittern, a possible closest relative from Central and South America

The generic name Rhynochetos, and the clade name Rhynochetidae, are derived from the Greek ῥίςrhis meaning "nose" and χαίτηkhaitē meaning "long hair", referring to its long stiff hairs over the nostrils. The specific name jubatus is derived from the Latin iubātus meaning crested. [6]

The kagu's affinities are not well resolved. It was long one of the most enigmatic birds and in more recent times is usually affiliated with the Gruiformes. It was initially classed as a member of the clade Ardeae because of the presence of powder down, similarities in plumage colour and internal anatomy, the colour of the chicks and eggs, and the change in colouration of the chick as it grows. [5] [ page needed ]

When seen as a gruiform, the kagu is generally considered related to the extinct adzebills from New Zealand and the sunbittern from Central and South America. Recent studies do indicate that the sunbittern is the closest living relative of the kagu. For example, Fain & Houde found these to be certainly sister taxa. [7] They and the mesites did not group with traditional Gruiformes in their study, but instead with their proposed clade Metaves, which also includes the hoatzin, pigeons, nightjars, flamingos, tropicbirds, Apodiformes, sandgrouse, and grebes. The internal structure of this group was not well resolvable by their data, although later studies confirmed a close relationship between the kagu and sunbittern. [8]

The kagu and sunbittern, and possibly the adzebills, seem to form a distinct Gondwanan lineage of birds, either as one order or possibly more. Although the relationships between them and groups previously considered related, such as the mesites and the "core Gruiformes," are not yet resolved. It is notable, however, that the sunbittern and the mesites possess powder down too, whereas the "core Gruiformes" do not. The ancestors of the kagu are believed to have diverged from the sunbittern in the Oligocene, 45 to 17 million years ago, and colonized New Caledonia 60 to 25 million years ago. In the absence of terrestrial predators, it eventually became flightless. [9]

While the kagu is the only living species in the clade Rhynochetidae, a larger species, the lowland kagu (Rhynochetos orarius), has been described from Holocene subfossil remains. The measurements of this species were 15% bigger than Rhynochetos jubatus, with no overlap in measurements except those of the forelimbs. Given that the sites from which R. orarius remains have been recovered are all lowland sites, and that no fossils of R. jubatus have been found in these sites, the scientists that described the fossils have suggested that they represent highland and lowland species respectively. R. orarius is one of many species to have become extinct in New Caledonia after the arrival of humans. [10] The validity of the species has been questioned by some authors, [5] but accepted by others. [11]

Description

The kagu possesses 'nasal corns', structures covering its nostrils, which are a feature not shared by any other bird. This bird is a juvenile, lacking the brightly coloured bill of the adult. Juvenile kagu.jpg
The kagu possesses 'nasal corns', structures covering its nostrils, which are a feature not shared by any other bird. This bird is a juvenile, lacking the brightly coloured bill of the adult.

The kagu is a ground-living bird, 55 cm (21+1⁄2 in) in length. The weight can vary considerably by individual and by season, ranging from 700 to 1,100 g (25–39 oz). Its plumage is unusually bright for a bird of the forest floor; ash-grey and white coloured. There is little sexual dimorphism beyond a difference in the amount of barring in the primary feathers. [5] [ page needed ] It possesses powder down which helps keep it dry and insulates it in the extremes of New Caledonia's tropical climate. The crest, which is used to display to other members of the species, is barely noticeable when at rest but can be erected and fanned out.

It is nearly flightless, using its wings for displays (its primary wing feathers are patterned), and for moving quickly through the forest. It can also use them to glide when fleeing danger. The wings are not reduced in size like some other flightless birds, and have a span of around 77.5 cm (30+1⁄2 in), but they lack the musculature for flight. [5] [ page needed ] [9] These wings are also used for a 'broken-wing' display, a behaviour shared with their relative sunbittern, used to fake an injury and draw the attention of a predator away from their chick. It possesses bright red legs which are long and strong, enabling the bird to travel long distances on foot and run quickly.

It has large eyes, positioned so that they give good binocular vision which is helpful in finding prey in the leaf litter and seeing in the gloom of the forest. It possesses 'nasal corns', structures covering its nostrils, which are a feature not shared by any other bird. These are presumed to prevent particles entering the nostrils when probing in soil during feeding. Another unique characteristic of the species is that it has only one-third as many red blood cells and three times more hemoglobin per red blood cell than is usual in birds. [5] [ page needed ]

Distribution and habitat

The kagu is endemic to the forests and shrubland of New Caledonia. Within that island group it is restricted to the main island of Grande Terre. There is no evidence that it occurred on the Loyalty Islands, although fossil remains of the extinct lowland form R. orarius have been found on the Ile des Pines. [11] The kagu is a habitat generalist and able to exist in a range of different forest types if sufficient prey is present, from rain forest to drier lowland forest. They are also able to feed in some drier shrubland associated with the island's ultrabasic rocks, although not in the poorest, low-prey shrubland of this type. They are also absent from areas where extensive ground cover makes foraging difficult, such as grassland or areas with high fern cover, but may pass through such areas to reach other foraging areas. The species has undergone some range contraction due to hunting and predation by introduced species. [5] Its original, pre-human distribution, and the extent to which it and its sister species R. orarius coexisted in lowland areas of New Caledonia, is still not fully understood and awaits further research into the subfossil record. [10]

Behaviour and ecology

Kagu are territorial, maintaining year-round territories of around 10–28 hectares (25–69 acres). [12] They have a clan-based social organization, with families composed of one breeding female and one to three breeding males. Male offspring also help to defend their parents' territorial claims. [9] [13] However the social organisation of kagu has been disrupted in recent years due to attacks by dogs and families. Cases where either the breeding male or female have been killed have led to non-fraternal polyandrous behaviour. Cooperative and unrelated polyandry is rare in birds, but has been seen in species such as the dunnock and the Tasmanian nativehen.

Within the territory the pairs are solitary during the non-breeding season, and may have separate but overlapping foraging areas. Kagus make a range of different sounds, most commonly while duetting in the morning, each duet lasting about 15 minutes. The kagu's crest and wings are used in territorial displays towards other kagu, slightly different displays are used towards potential predators. Territorial disputes may be resolved by fighting using wings and bills; in the wild this seldom results in serious injuries. [5] [13]

Diet

The kagu is exclusively carnivorous, feeding on a variety of animals with annelid worms, snails and lizards being amongst the most important prey items. [5] Also taken are larvae, spiders, centipedes and insects such as grasshoppers, bugs, and beetles. The majority of the diet is obtained from the leaf litter or soil, with other prey items found in vegetation, old logs and rocks. Sometimes kagus will hunt small animals in shallow water. Their hunting technique is to stand motionless on the ground or from an elevated perch, and silently watch for moving prey. They may stand on one foot and gently move the leaf litter with the other foot in order to flush prey. Having located prey they will move towards the prey and stand over it, ready to strike, or make a dash towards the prey from their watching location. If digging is required to obtain the prey this is done with the bill, the feet are not used to dig or scratch away debris. [5]

Breeding

Rhynochetos jubatus egg - MHNT Rhynochetos jubatus MHNT.ZOO.2010.11.2.19.jpg
Rhynochetos jubatus egg - MHNT

Kagus are monogamous breeders, generally forming long-term pair bonds that are maintained for many years, even possibly life.[ disputed – discuss ] Kagu can be long lived, with birds in captivity living for over 20 years. [5] A single nesting attempt is made each year, although should the first nesting attempt fail a second attempt is made that year. [12] A simple nest is constructed, which is little more than a heaped pile of leaves, although in some cases the egg may be laid directly on the ground. The nest is not concealed but is usually adjacent to a tree trunk, log or low vegetation. A single grey slightly blotched egg is laid which weighs 60–75 g. Incubation duties are shared by the parents. Each bird will incubate the egg for 24 hours, with the changeover occurring around noon each day. During each incubation stint the parent will remain on the egg the whole time except early in the morning, when the bird will briefly move away to call to its mate and occasionally forage quickly. The incubation period lasts for 33–37 days, which is long for the size of the egg. [5]

Offspring may remain in their parents' territory for many years after fledging, sometimes up to six years. [5] These chicks do not help in incubating the eggs or raising the chicks, but nevertheless improve the breeding success of the parents. The older offspring do apparently help in territory defence, responding to playback of rivals and also participating in territorial fights, and it has been suggested that this should be treated as a form of cooperative breeding. The kagu has also been observed adopting an unrelated chick, a behaviour more common in species with low reproductive output, high social organisation, and extensive parental care of the young, all traits shared by the kagu. [9]

Status and conservation

The current population of wild kagus is about 250-1000 birds, and the species is the focus of a decades-long conservation effort Kagu Rhynchetos jubatus detail.JPG
The current population of wild kagus is about 250–1000 birds, and the species is the focus of a decades-long conservation effort

The kagu's initial decline was caused by subsistence hunting. The bird was trapped extensively for the European pet trade [5] and for museums and zoos until it was afforded protection. [14] It is threatened by introduced cats, pigs and dogs. [15] New Caledonia lacked mammals (except for bats) before the arrival of humans, [16] and many of its native species have been negatively affected by introduced mammals. Rats have a big impact on nestlings, accounting for 55% of nestling losses. [17] Kagus also suffer from habitat loss caused by mining and forestry.

Concern was first raised about the future of the kagu in 1904. [18] A visiting American scientist noted in 1948 that the extinction of the species was probable, and identified the many threats the species faced. [14] The first concrete evidence of the impact of dogs came when a New Zealand researcher's study population was quickly exterminated by dogs in the 1990s, [19] although suspicions about the importance of dogs and other predators had been voiced before this and dog control measures had been enacted in some areas in the 1980s. [20] The kagu is listed as endangered (CITES I) and enjoys full protection in New Caledonia. It has been the subject of dedicated conservation efforts and is receptive to ex-situ conservation, breeding well in Nouméa Zoo. It is also prospering in Rivière Bleue Territorial Park, [21] which has a pest-management programme and has been the site of releases into the wild of captive-bred birds. [15]

Recent research has shown that naturally occurring heavy metals in the soil may affect Kagu through their food supply. Kagu in areas where soil levels of heavy metals were low laid more eggs and had higher numbers of fledglings, as well as having smaller home-ranges and higher body mass, than Kagu in areas where the soil was heavy-metal rich. It has therefore been suggested that Kagu conservation is likely to be more effective in areas where heavy-metal levels in the soil are low. [22]

Relationship with humans

The kagu had an important role in the traditional lives of the Kanak tribes of New Caledonia. Among the tribes found in the vicinity of Hienghène in the north of Grande Terre, its name was given to people, its crest was used in the head-dresses of chiefs, and its calls were incorporated into war dances and considered messages to be interpreted by the chiefs. Kanaks in the vicinity of Houaïlou referred to the species as the "ghost of the forest." [5]

The species was not discovered by Europeans until the French colonisation of New Caledonia in 1852 and was not described until a specimen was taken to the Colonial Exhibition in Paris in 1860. [18] This led to a surge in scientific interest in the species, which resulted in many birds being trapped for museums and zoos. The species was also trapped for food and was considered a delicacy by European colonisers. It was also fashionable to own kagus as pets. A campaign was run from 1977–1982 to phase out the pet trade in kagus. Today, the kagu is considered very important in New Caledonia; it is a high-profile endemic emblem for the territory. Its distinctive song used to be played to the nation every night as the island's TV station signed off the air. Its survival is considered important for the territory's economy and image. [5]

See also

Related Research Articles

<span class="mw-page-title-main">Philippine eagle</span> Endangered species of eagle in the Philippines

The Philippine eagle, also known as the monkey-eating eagle or great Philippine eagle, is a critically endangered species of eagle of the family Accipitridae which is endemic to forests in the Philippines. It has brown and white-colored plumage, a shaggy crest, and generally measures 86 to 102 cm in length and weighs 4.04 to 8.0 kg.

<span class="mw-page-title-main">Gruiformes</span> Order of birds

The Gruiformes are an order containing a considerable number of living and extinct bird families, with a widespread geographical diversity. Gruiform means "crane-like".

<span class="mw-page-title-main">Cuckoo</span> Family of birds

Cuckoos are birds in the Cuculidae family, the sole taxon in the order Cuculiformes. The cuckoo family includes the common or European cuckoo, roadrunners, koels, malkohas, couas, coucals, and anis. The coucals and anis are sometimes separated as distinct families, the Centropodidae and Crotophagidae, respectively. The cuckoo order Cuculiformes is one of three that make up the Otidimorphae, the other two being the turacos and the bustards. The family Cuculidae contains 150 species, which are divided into 33 genera.

<span class="mw-page-title-main">Sunbittern</span> Species of bittern-like bird

The sunbittern is a bittern-like bird of tropical regions of the Americas, and the sole member of the family Eurypygidae and genus Eurypyga. It is found in Central and South America, and has three subspecies. The sunbittern shows both morphological and molecular similarities with the kagu of New Caledonia, indicating a gondwanic origin, both species being placed in the clade Eurypygiformes.

<span class="mw-page-title-main">Killdeer</span> Shorebird found in the Americas

The killdeer is a large plover found in the Americas. It gets its name from its shrill, two-syllable call, which is often heard. It was described and given its current scientific name in 1758 by Carl Linnaeus in the 10th edition of his Systema Naturae. Three subspecies are described. Its upperparts are mostly brown with rufous fringes, the head has patches of white and black, and two black bands cross the breast. The belly and the rest of the breast are white. The nominate subspecies breeds from southeastern Alaska and southern Canada to Mexico. It is seen year-round in the southern half of its breeding range; the subspecies C. v. ternominatus is resident in the West Indies, and C. v. peruvianus inhabits Peru and surrounding South American countries throughout the year. North American breeders winter from their resident range south to Central America, the West Indies, and the northernmost portions of South America.

<span class="mw-page-title-main">Common murre</span> Species of bird

The common murre, also called the common guillemot or foolish guillemot, is a large auk. It has a circumpolar distribution, occurring in low-Arctic and boreal waters in the North Atlantic and North Pacific. It spends most of its time at sea, only coming to land to breed on rocky cliff shores or islands.

<span class="mw-page-title-main">American purple gallinule</span> Species of bird

The purple gallinule is a swamphen in the genus Porphyrio. It is in the order Gruiformes, meaning "crane-like", an order which also contains cranes, rails, and crakes. The purple gallinule is a rail species, placing it into the family Rallidae. It is also known locally as the yellow-legged gallinule. The specific name martinica denotes "of Martinique".

<span class="mw-page-title-main">Biodiversity of New Caledonia</span> Variety of life in the New Caledonia archipelago and its seas

The biodiversity of New Caledonia is of exceptional biological and paleoecological interest. It is frequently referred to as a biodiversity hotspot. The country is a large South Pacific archipelago with a total land area of more than 18,000 square kilometres (6,900 sq mi). The terrain includes a variety of reefs, atolls, small islands, and a variety of topographical and edaphic regions on the largest island, all of which promote the development of unusually concentrated biodiversity. The region's climate is oceanic and tropical.

<span class="mw-page-title-main">Adzebill</span> Extinct genus of birds

The adzebills, genus Aptornis, were two closely related bird species, the North Island adzebill,, and the South Island adzebill,, of the extinct family Aptornithidae. The family was endemic to New Zealand. A tentative fossil species,, is known from the Miocene Saint Bathans fauna.

<i>Rhynochetos</i> Genus of birds

Rhynochetos is a genus of ground-dwelling birds in the monotypic family Rhynochetidae. It contains two species, both endemic to New Caledonia, one of which is extinct.

<span class="mw-page-title-main">Storm's stork</span> Species of bird

Storm's stork is a medium-sized stork species that occurs primarily in lowland tropical forests of Indonesia, Malaysia and southern Thailand. It is considered to be the rarest of all storks, and is estimated to number less than 500 wild individuals throughout its geographic range. The population has long been in decline and the primary cause is widely considered to be deforestation of its native habitat.

<span class="mw-page-title-main">Brown mesite</span> Species of bird

The brown mesite is a ground-dwelling bird endemic to Madagascar. It is one of three species in the mesite family or the Mesitornithidae, and though classified as vulnerable by the International Union for Conservation of Nature (IUCN), it is the most widespread of the three.

<span class="mw-page-title-main">White-throated nightjar</span> Species of bird

The white-throated nightjar or white-throated eared-nightjar is a species of nightjar in the family Caprimulgidae. It is endemic to eastern Australia; it is a non-breeding winter visitor in Papua New Guinea. Its natural habitat is subtropical or tropical dry forests.

<span class="mw-page-title-main">Shining bronze cuckoo</span> Species of bird

The shining bronze cuckoo is a species of cuckoo in the family Cuculidae, found in Australia, Indonesia, New Caledonia, New Zealand, Papua New Guinea, Solomon Islands, and Vanuatu. It was previously also known as Chalcites lucidus.

<span class="mw-page-title-main">Pavonine cuckoo</span> Species of bird

The pavonine cuckoo is a Neotropical cuckoo with a long graduated tail and a short crest. It is one of three species of Neotropical cuckoo which are known to be brood parasites.

<span class="mw-page-title-main">Ouvea parakeet</span> Species of bird

The Ouvea parakeet or Uvea parakeet, is a species of parrot in the genus Eunymphicus, in the family Psittaculidae. It is endemic to the island of Uvea in the Loyalty Islands, New Caledonia. The species was once considered conspecific with the horned parakeet of Grande Terre, but they have now been split into two species.

<span class="mw-page-title-main">Eurypygiformes</span> Order of birds

Eurypygiformes is an order formed by the kagus, comprising two species in the family Rhynochetidae endemic to New Caledonia, and the sunbittern from the tropical regions of the Americas. Its closest relatives appear to be the tropicbirds of the tropical Atlantic, Indian, and Pacific oceans.

The lowland kagu is a large, extinct species of kagu. It was endemic to the island of New Caledonia in Melanesia in the south-west Pacific region. It was described from subfossil bones found at the Pindai Caves paleontological site on the west coast of Grande Terre. The holotype is a right tibiotarsus, held by the Muséum national d'histoire naturelle in Paris. The specific epithet comes from the Latin orarius from its presumed lowland distribution, as opposed to its congener the living kagu R. jubatus.

<span class="mw-page-title-main">Eurypygimorphae</span> Clade of birds

Eurypygimorphae or Phaethontimorphae is a clade of birds that contains the orders Phaethontiformes (tropicbirds) and Eurypygiformes recovered by genome analysis. The relationship was first identified in 2013 based on their nuclear genes. Historically these birds were placed at different parts of the tree, with tropicbirds in Pelecaniformes and the kagu and sunbittern in Gruiformes. Some genetic analyses have placed the eurypygimorph taxa in the controversial and obsolete clade Metaves, with uncertain placement within that group. More recent molecular studies support their grouping together in Eurypygimorphae, which is usually recovered as the sister taxon to Aequornithes within Ardeae.

References

  1. ↑ BirdLife International (2019). "Rhynochetos jubatus". IUCN Red List of Threatened Species . 2019: e.T22692211A156666402. doi: 10.2305/IUCN.UK.2019-3.RLTS.T22692211A156666402.en . Retrieved 19 November 2021.
  2. ↑ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ↑ Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (2023). "Kagu, Sunbittern, tropicbirds, loons, penguins". World Bird List Version 13.1. International Ornithologists' Union. Retrieved 8 April 2023.
  4. ↑ "Kagu". Oxford English Dictionary. Oxford University Press. Retrieved 11 January 2011.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 del Hoyo, J.; Elliott, A.; Sargatal, J., eds. (1996). Handbook of the Birds of the World. Vol. 3: Hoatzin to Auks. Lynx Edicions. ISBN   84-87334-20-2.
  6. ↑ Jobling, James A. (1991). A Dictionary of Scientific Bird Names. Oxford: Oxford University Press. pp. 119, 335. ISBN   978-0-19-854634-4.
  7. ↑ Fain, Matthew G.; Houde, Peter (2004). "Parallel Radiations in the Primary Clades of Birds" (PDF). Evolution. 58 (11): 2558–73. doi:10.1554/04-235. PMID   15612298. S2CID   1296408. Archived from the original (PDF) on 2013-04-07.
  8. ↑ Hackett, S.J. et al. (2008) A Phylogenomic Study of Birds Reveals Their Evolutionary History. Science, 320(5884):1763–1768.
  9. 1 2 3 4 Theuerkauf, Jörn; Rouys, Sophie; Bloc, Henri; Hunt, Gavin R.; Kuehn, Ralph; Gula, Roman (February 2021). "Some like it odd: Long-term research reveals unusual behaviour in the flightless Kagu of New Caledonia". Austral Ecology. 46 (1): 151–154. doi:10.1111/aec.12962. ISSN   1442-9985. S2CID   225105558.
  10. 1 2 Balouet, Jean C.; Storrs L. Olson (1989). "Fossil birds from Late Quaternary deposits in New Caledonia" (PDF). Smithsonian Contributions to Zoology. 469 (469): 28–32. doi:10.5479/si.00810282.469. Archived from the original (PDF) on 2012-03-27.
  11. 1 2 Steadman, David (2006). Extinction and Biogeography in Tropical Pacific Birds. Chicago: University of Chicago Press. p. 158. ISBN   978-0-226-77142-7.
  12. 1 2 Salas, Michel; Yves Letocart (1997). "Spatial Organisation and Breeding of Kagu Rhynochetos jubatus in Rivière Bleue Park, New Caledonia". Emu. 97 (2): 97–107. doi:10.1071/MU97013.
  13. 1 2 Theuerkauf, Jörn; Rouys, Sophie; Mériot, Jean Marc; Gula, Roman (2009). "Group Territoriality as a form of Cooperative Breeding in the Flightless Kagu (Rhynochetos jubatus) of New Caledonia". Auk. 126 (2): 371–375. doi:10.1525/auk.2009.08092. S2CID   85877849. Lock-green.svg
  14. 1 2 Warner, Willard (1948). "The Present Status of the Kagu, Rhynochetos jubatus, on New Caledonia" (PDF). Auk. 65 (2): 287–288. doi:10.2307/4080305. JSTOR   4080305.
  15. 1 2 O'Neill, Thomas (2000) National Geographic197(5): pp. 54–75, page 74
  16. ↑ Steadman D (2006). Extinction and Biogeography in Tropical Pacific Birds, University of Chicago Press. ISBN   978-0-226-77142-7
  17. ↑ Ekstrom, J; Jones, J; Willis, J; Tobias, J; Dutson, G; Barré, N (2002). "New information on the distribution, status and conservation of terrestrial bird species in Grande Terre, New Caledonia". Emu . 102 (2): 197. doi:10.1071/MU01004. S2CID   85342052.
  18. 1 2 Campbell, A.J. (1904). "The kagu of New Caledonia". Emu. 4 (4): 166–168. doi:10.1071/MU904166.
  19. ↑ Hunt, G.R.; Hay, R. & Veltman, C.J. (1996). "Multiple kagu Rhynochetos jubatus deaths caused by dog attacks at a high altitude study site on Pic Ningua, New Caledonia". Bird Conservation International. 6 (4): 295–306. doi: 10.1017/S0959270900001775 .
  20. ↑ Tolmé, P (2003). "Gray Ghosts of the Cloud Forest". National Wildlife. 41 (6). Archived from the original on 2004-02-18.
  21. ↑ also known as Rivière Bleue Provincial Park and Rivière Bleue National Park
  22. ↑ Theuerkauf, J.; Haneda, T.; Okahisa, Y.; Sato, N. J.; Rouys, S.; Bloc, H.; Ueda, K.; Watanabe, I.; Kuehn, R.; Gula, R. (2017). "Elevated concentrations of naturally occurring heavy metals inversely correlate with reproductive output and body mass of the Kagu Rhynochetos jubatus". Ibis. 159 (3): 580–587. doi:10.1111/ibi.12474.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.