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White-throated Toucan - BirdForum Opus

(Redirected from Cuvier's Toucan)
Photo © by natuurflits.nl
Locality: suriname, South America, February, 2008
Ramphastos tucanus

Identification

Subspecies cuvieri
Photo © by Stanley Jones
Florida Baja, Madre de Dios Department, Peru, August 2018

A large Toucan with a total length of 55-60 cm. (22-24 in).
Males are larger and longer-billed than females.
The belly, upperparts and tail are black, the throat and chest are white, the crissum and a relatively narrow chest-band are red
The uppertail coverts are yellow, the ocular skin is blue, the base of the bill is yellow and blue, and the culmen and bill-tip are yellow.

Variations

There are three subspecies (see Distribution & Taxonomy), which mainly differ in the colour of the bill:

  • Red-billed Toucan (R. t. tucanus):

The main section of the bill is reddish-brown.

  • Cuvier's Toucan (R. t. cuvieri):

The main section of the bill is black (no reddish-brown).

  • Inca Toucan (R. t. inca):

The main section of the bill is black, with some redddish-brown on the central part of the bill.

Similar Species

The Red-billed Toucan and the Inca Toucan are easily recognized by the diagnostic reddish-brown patches on the bill. Cuvier's Toucan is very similar to the Yellow-ridged Toucan, but can be recognize by its larger size, its proportionally longer bill, and its "flatter" (less keeled) culmen. Their voices also differ, with Cuvier's Toucan having a yelping voice similar to that of the Red-billed and the Inca Toucan, but unlike the croaking voice of the Yellow-ridged Toucan.

Distribution

It is widespread in the Amazon region in South America, with R. t. tucanus in the north-eastern part of its range (East Venezuela, the Guianas and North East Brazil), R. t. cuvieri in the western and south-central Amazon (South West Venezuela, South East Colombia, East Ecuador, East Peru and West and Central Brazil), R. t. inca in northern Bolivia.

Taxonomy

Previously, this species was split into two species, with R. tucanus being a monotypic species, and R. cuvieri including inca as a subspecies. However, they all interbreed freely wherever their ranges meet, leading to large areas populated by individuals showing some level of intermediacy between the "true" races. It is possible R. t. inca actually is a semi-stable hybrid population between R. t. tucanus and R. t. cuvieri.

Subspecies

There are 3 subspecies[1]:

  • R. t. tucanus:
  • R. t. cuvieri:
  • R. t. inca:
  • North and central Bolivia

Habitat

Found in various forested habitats, mainly (but not exclusively) humid. Mainly in lowlands, but locally to an altitude of 1500 m (5000 ft). It is generally fairly common.

Behaviour

Diet

Omnivorious and highly opportunistic. Food includes various fruits, insects, reptiles and small birds (esp. nestlings of e.g. the Yellow-rumped Cacique).

Breeding

Largely seasonal, but exact timing differs between regions. The 2-3 eggs are placed in a tree cavity. Both sexes participate in incubating the eggs and feeding the chicks.

References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Handbook of the Birds of the World Alive (retrieved January 2019)
  3. BF Member observations

Recommended Citation

External Links

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