Introduction
The Yellow-knobbed Curassow (Crax daubentoni) is a large, mainly terrestrial member of the Cracidae family, which also includes guans and chachalacas. It occurs in northern Venezuela and adjacent north-eastern Colombia, where it uses gallery forest, tall scrub and other wooded habitats associated with the Llanos. The species is recognised by the male’s conspicuous yellow bill knob and its contrasting black-and-white plumage.
Physical Description
The Yellow-knobbed Curassow is a large bird measuring approximately 84–92.5 cm in length. Recorded body mass varies considerably, from about 1.6 to 3.2 kg, with males generally heavier than females.
Adult males are predominantly glossy black, with a white lower belly, vent and undertail area. They have a shaggy, forward-curving crest and a prominent yellow cere, knob and wattles at the base of the bill. This fleshy ornament is most developed in mature males.
Females are also mainly dark-plumaged but lack the yellow bill knob. They usually show pale or whitish barring on the crest, breast and upper belly, together with white-tipped tail feathers. These differences make the sexes relatively straightforward to distinguish when seen well. Young birds are less strongly marked and do not show the fully developed facial ornaments of adult males.
Range and Habitat
The Yellow-knobbed Curassow is restricted to northern South America. Its range extends through the Llanos of north-eastern Colombia and northern Venezuela, including areas north of the Orinoco and adjacent foothills. It is a resident species rather than a long-distance migrant, although local movements may occur in response to food availability and habitat conditions.
It is associated particularly with gallery forest, tall scrub, dry forest and other wooded habitats within open or seasonally dry landscapes. It may also occur in valleys and ravines in nearby foothills. In Venezuela, the species has been studied in the central Llanos, including fragmented landscapes where remaining forest patches provide nesting habitat.
Loss and fragmentation of forest through agricultural expansion, logging and other land conversion reduce the amount and continuity of suitable habitat. The species’ restricted distribution makes the protection of remaining forest corridors and gallery-forest patches especially important.
Behaviour and Diet
The Yellow-knobbed Curassow spends much of its time on the ground, where it searches through leaf litter and beneath fruiting trees. It may occur in pairs, family groups or small groups, and it can move between forest patches where suitable cover remains. Like other curassows, it can fly into trees when disturbed, to roost or to escape danger, but it is not a sustained long-distance flier.
Its diet is dominated by plant material. Research in the Venezuelan Llanos recorded fruits, seeds and leaves as the main food items, with smaller amounts of flowers, roots, fungi, seedlings, minerals and invertebrates. Beetles and other small invertebrates may supplement the diet, particularly when plant foods are less available.
Many seeds pass through the digestive tract intact. This suggests that the species can contribute to seed dispersal and forest regeneration, although its effectiveness varies with the plants it eats, the distance seeds are moved and the condition of the surrounding habitat.
Males use vocal and visual displays during courtship. The species is noted for a descending whistle display that may be accompanied by wing movements or other display sounds. Nesting has been documented in fragmented landscapes in the Venezuelan Llanos. Available accounts indicate that the nest is usually placed in vegetation, often above ground, and that the typical clutch contains two eggs. Detailed information on lifespan and juvenile survival in the wild remains limited.
Identification Tips
Look for a large, dark curassow with a white lower belly and undertail area, a long tail and a forward-curving crest.
- An adult male is distinguished by the bright yellow knob and wattles at the base of the bill.
- A female lacks the yellow bill ornament and usually shows pale barring on the crest, breast and upper belly.
- White-tipped tail feathers are useful when identifying females.
- The species is most likely to be encountered walking quietly on the forest floor, along gallery-forest edges or in tall scrub.
- The Great Curassow (Crax rubra) has a superficially similar black-and-white male with a bill knob, but its normal range is farther west and the two species are not generally sympatric. Female plumage is also different, making range, bill colour and tail pattern important when separating them.
Conservation Status
The Yellow-knobbed Curassow is currently listed as Near Threatened on the IUCN Red List. Its population is considered to be declining, primarily because of habitat loss, habitat fragmentation and hunting.
Agricultural expansion, logging and the degradation of gallery forest reduce available habitat and isolate local populations. Hunting can be particularly damaging because curassows are large, conspicuous ground-feeding birds and reproduce relatively slowly compared with many smaller species. The available evidence does not support a reliable global population estimate for inclusion here.
Important conservation measures include protecting remaining gallery forests and other suitable woodland, maintaining habitat connections between forest patches, reducing hunting pressure and improving knowledge of population trends. Nest-site studies in the Venezuelan Llanos also highlight the value of conserving suitable vegetation within fragmented landscapes. Protected areas, effective enforcement and cooperation with local communities are likely to be important to the species’ long-term security.
Frequently Asked Questions
Where does the Yellow-knobbed Curassow live?
It occurs in northern Venezuela and adjacent north-eastern Colombia, especially in the Llanos and nearby foothills. It uses gallery forest, tall scrub, dry forest and other wooded habitats.
What does the Yellow-knobbed Curassow eat?
Its diet consists mainly of fruits, seeds and leaves. It also consumes small amounts of flowers, roots, fungi, seedlings, minerals and invertebrates such as beetles.
How can a male Yellow-knobbed Curassow be identified?
The adult male is mostly glossy black with a white lower belly and a prominent yellow knob and wattles at the base of the bill. It also has a shaggy, forward-curving crest.
How can a female Yellow-knobbed Curassow be identified?
The female lacks the yellow bill knob and usually has pale barring on the crest, breast and upper belly. White-tipped tail feathers are another useful field mark.
Is the Yellow-knobbed Curassow endangered?
It is classified as Near Threatened rather than Endangered on the IUCN Red List. However, its population is declining because of habitat loss, fragmentation and hunting.
Does the Yellow-knobbed Curassow migrate?
No long-distance migration is known. It is regarded as a resident species, although individuals may make local movements between suitable forest patches as food and cover change.
References
- BirdLife International. 2026. Yellow-knobbed Curassow Crax daubentoni. BirdLife DataZone. Accessed 8 September 2026. https://datazone.birdlife.org/
- BirdLife International and IUCN. 2025. Crax daubentoni, Yellow-knobbed Curassow. IUCN Red List of Threatened Species. Accessed 8 September 2026. https://www.iucnredlist.org/
- Bertsch, C. B. 2008. Diet of the Yellow-knobbed Curassow in the Central Venezuelan Llanos. The Wilson Journal of Ornithology 120(4): 767–777. https://doi.org/10.1676/07-172.1
- Buchholz, R. 1995. The descending whistle display and female visitation rates in the Yellow-knobbed Curassow, Crax daubentoni, in Venezuela. Ornitología Neotropical 6(1): 27–36. https://digitalcommons.usf.edu/ornitologia_neotropical/vol6/iss1/3/
- Kvarnbäck, J., Bertsch, C. and Barreto, G. R. 2008. Nest site selection and nesting success of the Yellow-knobbed Curassow (Crax daubentoni) in a fragmented landscape in the Venezuelan Llanos. Ornitología Neotropical 19(5), Article 19. https://digitalcommons.usf.edu/ornitologia_neotropical/vol19/iss5/19/
- del Hoyo, J. and Kirwan, G. M. 2020. Yellow-knobbed Curassow (Crax daubentoni), version 1.0. In J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie and E. de Juana, eds, Birds of the World. Cornell Lab of Ornithology. https://doi.org/10.2173/bow.yekcur1.01
- Gill, F., Donsker, D. and Rasmussen, P., eds. 2026. IOC World Bird List, version 15.2. International Ornithologists’ Union. Accessed 8 September 2026. https://www.worldbirdnames.org/
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