CHANNEL-BILLED TOUCAN

The ' Channel-billed Toucan' (''Ramphastos vitellinus'') is a near-passerine bird which breeds in Trinidad and in tropical South America as far south as southern Brazil and central Bolivia.

Contents

Taxonomy

Description

Habitat

Behavior

References

External links

Bibliography

Taxonomy

The races were previously considered separate species, but all interbreed freely whereever they meet. These are the 'Yellow-ridged Toucan' (''R. culminatus''; now ''R. vitellinus culminatus''), the 'Citron-throated Toucan' (''R. citreolaemus''; now ''R. vitellinus citreolaemus'') and the 'Ariel Toucan' (''R. ariel''; now ''R. vitellinus ariel''). However, the subspecies ''R. v. ariel'' is closer to ''R. v. culminatus'' than to the nominate, and are by some already considered close to distinct species status. As ''R. v. ariel'' was described before ''R. v. culminatus'', if separated they would become ''Ramphastos ariel ariel'' and ''R. a. culminatus''. There also exists an isolated population in eastern Brazil. It looks very similar to, and has traditionally been considered part of, ''R. v. ariel'', but molecular analysis suggests that it has been isolated for a long time and is a yet-undescribed separate subspecies or possibily even species (Weckstein, 2005).

Description

Like other toucans, the Channel-billed is brightly marked and has a huge bill. It is typically 48 cm (19 in) long with a 9-14 cm (3½-5½ in) bill.

★ Nominate race (''R. v. vitellinus''): Its upperparts, belly, tail and most of the bill are black, and the uppertail and undertail coverts are red. The bare eye-patch and bill base are blue, the throat is white, the central breast has a large orange-yellow spot and the lower breast a broad red band. The iris is dark brownish. It is found in the north-eastern part of this species' range.

★ Race ''culminatus'': It resemble the nominate, but has a yellow base of the upper mandible and ridge to its bill, orange-yellow uppertail coverts and the throat and breast are white (occasionally tinged yellow), with just a narrow red band separating the latter from the black belly. It occurs in the eastern and south-central part of this species' range. It is very similar to, and easily confused with, Cuvier's Toucan (''Ramphastos tucanus cuvieri'').

★ Race ''ariel'': It resemble the nominate, but the base of its bill is yellow, the skin around the pale blue eye is red and the entire throat and chest are orange. It occurs in the south-east Amazon. The unnamed population from the coastal regions of eastern Brazil is virtually identical.

★ Race ''citreolaemus''. It resemble ''culminatus'', but with a clear yellow tinge to the throat, a green tinge to the othewise yellow culmen, a yellow-orange patch at the very base of the bill, and a pale bluish iris. It occurs in northern Colombia and north-western Venezuela.
Whereever the distributions of the subspecies meet, individuals with features that are intermediate compared to above described races are common due to hybridization. Some of these intermediate populations have sometimes been awarded subspecies status, e.g. ''theresae'' for the population in north-eastern Brazil and ''pintoi'' for populations in south-central Brazil (both are ''culminatus''-''ariel'' intergrades).

Habitat

Found in forest and woodland. Prefers humid regions, but locally extends into drier regions (esp. along rivers). Mainly in lowlands, but locally to an altitude of 1700 m (5600 ft).

Behavior

This species is an arboreal fruit-eater, but will take insects and other small prey, e.g. insects, small reptiles and eggs and nestlings of other birds. The call is a croaking ''cree-op cree-op cree-op''.
The parents are both active in raising the young. The white eggs are laid in a high unlined tree cavity. There is have a gestation period of 18 days, and the parents both incubate for 15 to 16 days. However, they can be impatient sitters, often leaving their eggs uncovered for hours at a time. Newborn toucans remain in the nest after hatching. They are blind and naked at birth, and their eyes open after about 3 weeks. They have short bills and specialized pads on their heels to protect them from the rough floor of the nest. The feathers do not begin to expand until they are nearly 4 weeks old. They are helpless and unable to leave the nest for about 8 weeks, dependent upon both parents to feed them. After this, the young can care for themselves. They begin to leave the nest after 40 to 50 days, depending on size.

References

★ Database entry includes justification for why this species is of least concern

★ Hilty, Steven L. (2002): ''Birds of Venezuela''. ISBN 0-7136-6418-5

★ Weckstein, Jason D. (2005): Molecular Phylogenetics of the Ramphastos Toucans: Implications for the Evolution of Morphology, Vocalizations, and Coloration. ''Auk'' '122'(4): 1191–1209. PDF fulltext. Erratum in ''Auk'' '123'(2): 610 (2006).

★ A Guide to the Birds of Trinidad and Tobago, , Richard, ffrench, Comstock Publishing, 1991,

External links

★ Channel-billed Toucan videos on the Internet Bird Collection

★ Extensive Gallery on Toucans

★ List of Toucans

★ Toucan videos on the Internet Bird Collection

★ Stamps (for Brazil, Colombia, France, French Guiana, Guyana, Suriname, Trinidad and Tobago)

★ Channel-billed Toucan photo gallery VIREO

Bibliography

★ Bibliography of online, ornithological articles which explore the natural history of the Toco toucan, ''Ramphastos toco toco''.