Yellow-knobbed Curassow
Crax daubentoni
A large, elegant black and white turkey-like bird with a prominent curly crest. Both sexes have a white belly and white tipped tail, but the male has a larger crest and yellow base to the bill with a large yellow knob; female is faintly barred white on the breast and has dark gray bill lacking the knob. No overlap with other curassow species. Found in dry forest, gallery forest, and humid forest; most often encountered walking in understory or crossing trails in small groups, but sometimes also seen perched higher in trees. Vocally active in breeding season; song is a surprisingly high-pitched, long, descending whistle “WHEEEeeeeeeeeeeuuuuuuuuuuu,” reminiscent of a raptor.
Identification
The yellow-knobbed curassow is 84 to 92.5 cm (2.8 to 3.0 ft) long. Males usually weigh between 2,925 and 3,200 g (6.4 and 7.1 lb) but one weighed only 1,625 g (3.6 lb). A female weighed 2,325 g (5.1 lb). The male is the only curassow with a knobbed yellow cere and wattle. Males and females are mostly black with a white lower belly, vent area, and tips of the tail feathers. Females have a black cere and pale barring on the breast and lower belly.
Taxonomy
The yellow-knobbed curassow was formerly classified as a subspecies of blue-billed curassow (Crax alberti). It is monotypic. A few subspecies previously proposed for it were determined to be hybrids or aberrant individuals and so were not adopted.
- Scientific name
- Crax daubentoni
- Authority
- Gray, GR, 1867
- Order
- Galliformes
- Family
- Cracidae
- Genus
- Crax
Range and habitat
The yellow-knobbed curassow is found in northern Venezuela as far east as Sucre and Monagas states and in immediately adjacent northeastern Colombia. It primarily inhabits gallery forest and tall scrub in the llanos. It also occurs in valleys and ravines in the nearby foothills. In elevation it ranges between 500 and 1,500 m (1,600 and 4,900 ft) in Colombia and 100 and 800 m (330 and 2,600 ft) in Venezuela.
- Migration
- Resident species
Behavior
The yellow-knobbed curassow forages in small family groups, or in combined ones of up to 15 birds in the dry season. Its primary foods are fruits and seeds with very small amounts of leaves, other plant parts, and insects. It feeds at all levels from the ground to the treetops.<p>The yellow-knobbed curassow lays eggs during May and June, the early part of the rainy season. It appears to be polygynous. It builds an oval nest of branches and lianas lined with leaves and grass and usually sites it in a tree and concealed by vines. The clutch size is two eggs.<p>Male yellow-knobbed curassows sing a "bomb-dropping" descending whistle, sometimes combined with a wing-clapping display or booming. The former is "4–10 rapid cracks of wings above the bird’s back, 'wapp!, wapp!, wapp!-wapp!-wapp!'". The booming is described as "uuumh...uhh".
Conservation
- Population trend
- declining
Photos
Distribution
Bird Calls
Other Birds
Mottled Spinetail
Telacanthura ussheri
Medium-sized swift with erratic flight. Note the dark underparts and white rump patch, which separate it from other spinetails. Seen on the wing over moist savannah, woodland, and gallery forest. Often in areas with baobabs, which are a favored nesting site. Usually solo or in pairs. Similar in appearance to Little Swift, but Mottled Spinetail shows a pale band across the bottom of the belly, and flies more weakly, with the wings pushed forwards.
Square-tailed Nightjar
Caprimulgus fossii
Medium-sized, typical nightjar with bold pale spots on the back. Both sexes have a broad pale patch on the outer tail that is white in males and buff in females. Found in a variety of woodland and savanna habitats that are usually moist and often near water. Song is an extraordinarily long, dry trill that changes in speed and pitch. Most similar to Swamp Nightjar, but has smaller pale patches in the outer tail and lacks a blackish cheek; male has a white trailing edge to the wing in flight. Also similar to Montane Nightjar but found in different habitat.
Tawny Fish-Owl
Ketupa flavipes
A large brown owl with wide yellow eyes and sideways-drooping ear tufts; rich tawny brown plumage with black mottling unique in its range. Always found in close proximity to rivers or lakes, usually roosting in dense waterside groves by day. Hunts fish from a low perch at dusk and at night. Hunting birds are seldom observed, as they hunt from tangles and other dense vegetation. Other horned owls in range are either much smaller (Long-eared Owl, scops-owls) or much larger (Eurasian Eagle-Owl). Pairs duet, giving 2-3 deep hoots; younger birds beg with higher-pitched screeching calls.
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