Introduction
The Blue-billed Curassow (Crax alberti) is a large, ground-dwelling cracid endemic to northern Colombia. It inhabits humid forest in the lowlands, foothills and lower mountain slopes, but its former range has been severely reduced by deforestation and hunting. The species is listed as Critically Endangered and is now confined to a scattered network of remaining forest areas.
Physical Description
The Blue-billed Curassow is a large, turkey-sized bird measuring approximately 82.5–92 cm in length. It has a strong bill, powerful legs and a curled crest, and spends much of its time walking on the forest floor.
Males are predominantly glossy black, with a white vent and white on the tail tip. Their most distinctive feature is the bright blue cere, or fleshy structure at the base of the bill, together with a blue wattle hanging below the bill. The male’s blue bill ornamentation is unusual among curassows and gives the species its common name.
Females are also mainly black but have fine white barring on the wings and tail, black-and-white crest feathers, and rufous or chestnut colouring on the lower belly and undertail. Females generally lack the prominent bill knob or cere of the male, although both sexes have a blue wattle.
Range and Habitat
The Blue-billed Curassow is endemic to Colombia. Historically, it occurred across parts of northern Colombia, including the foothills of the Sierra Nevada de Santa Marta, the northern Andean foothills and the Middle Magdalena Valley. Its present distribution is much more restricted and fragmented, with surviving populations located in isolated forest remnants.
It is associated mainly with humid, mature and structurally diverse forest in lowland and foothill regions. Records extend into lower mountain areas, broadly up to about 1,200 metres above sea level. Although the species can occur in some secondary forest, it depends on substantial areas of suitable forest and is particularly vulnerable to fragmentation.
The Blue-billed Curassow is resident rather than migratory. Its limited range and poor ability to move between isolated forest patches increase its vulnerability to local habitat loss and hunting.
Behaviour and Diet
Blue-billed Curassows are primarily terrestrial and usually forage during the day on the forest floor. They are secretive and are often detected by their calls rather than seen. They may occur singly, in pairs or in small family groups, and roost in trees at night.
The diet consists mainly of fallen fruit, seeds and plant material, supplemented by invertebrates such as insects and worms. Small stones or grit may also be swallowed to aid digestion. Carrion has been reported as a possible occasional food item, but the species’ feeding ecology remains incompletely studied.
During the breeding season, males produce a distinctive low booming or “poujido” call to attract females. Breeding has been reported mainly from December to March, although timing may vary between localities. The clutch usually contains one or two eggs. Nests are relatively simple platforms made from plant material, and observations have included nests in secondary forest. Young are precocial, hatching well feathered and able to leave the nest soon after hatching.
Identification Tips
- Look for a large, heavy-bodied black bird walking quietly through humid forest or dense undergrowth.
- A male is recognised by the vivid blue cere at the base of the bill, the blue hanging wattle, curled black crest, white vent and white tail tip.
- A female lacks the male’s prominent cere and shows fine white barring on the wings and tail, together with a rufous lower belly and undertail.
- The species is more likely to be heard than seen. The male’s deep booming call can be especially useful during the breeding season.
- The combination of a blue bill ornament, black plumage and Colombian lowland or foothill forest helps distinguish it from other curassows. Care is still needed because several large cracids share similar dark plumage and may occur in overlapping regions.
Conservation Status
The Blue-billed Curassow is currently classified as Critically Endangered. Its population is considered to be declining, although precise estimates remain difficult because surviving groups are scattered and the species is difficult to survey reliably.
The principal threats are habitat loss and fragmentation caused by agricultural expansion, livestock production, logging, mining, oil extraction, plantations and infrastructure development. Hunting for food is also a serious threat, particularly where remaining forest fragments are accessible. The species’ restricted distribution means that the loss of a single forest block or local population can have a substantial effect on its global status.
Important conservation measures include protecting remaining humid forest, preventing hunting, improving management of existing reserves and maintaining connections between forest fragments. Research, camera-trap surveys and local monitoring are needed to clarify the distribution and status of remnant populations. Conservation planning has also included population and habitat viability assessments, while some zoos and conservation centres maintain managed populations as part of broader species-recovery efforts. However, recent research indicates that reducing hunting pressure is especially important, and captive supplementation cannot replace effective protection of wild habitat.
Frequently Asked Questions
Where does the Blue-billed Curassow live?
It is found only in northern Colombia, where it occupies humid lowland, foothill and lower mountain forests. Much of its former range has been lost, and surviving populations are restricted to fragmented forest areas.
Why is the Blue-billed Curassow Critically Endangered?
The species is threatened mainly by the destruction and fragmentation of its forest habitat, together with hunting. Its small, isolated populations are particularly vulnerable to further local losses.
What does the Blue-billed Curassow eat?
It mainly eats fallen fruit, seeds and other plant material, but also takes insects, worms and other small invertebrates. It may swallow grit or small stones to assist digestion.
How can the male Blue-billed Curassow be identified?
The male is mostly black and has a bright blue cere and hanging wattle, a curled crest, a white vent and a white tail tip. The blue bill ornament is the species’ most distinctive field mark.
Are male and female Blue-billed Curassows different?
Yes. The male has the prominent blue cere and is mainly glossy black. The female has barred wings and tail, black-and-white crest feathers and rufous colouring on the lower belly and undertail.
What conservation actions can help this species?
The most important actions are protecting and restoring humid forest, preventing hunting, improving the management of reserves and maintaining habitat connections between isolated populations. Reliable monitoring is also essential for guiding recovery work.
References
- BirdLife International. 1992. Threatened Birds of the Americas: The ICBP/IUCN Red Data Book. BirdLife International, Cambridge, UK. Species account for Crax alberti. Available at: https://birdlifedata.blob.core.windows.net/red-data-books/Crax_alberti_eng.pdf (accessed 8 September 2026).
- BirdLife International. 2025. Red List status changes 2025. BirdLife International. Species assessment entry for Crax alberti, retained as Critically Endangered. Available at: https://forums.birdlife.org/wp-content/uploads/2024/11/Red_List_status_changes_2025.pdf (accessed 8 September 2026).
- del Hoyo, J. & Kirwan, G. M. 2020. Blue-billed Curassow (Crax alberti), version 1.0. In: Billerman, S. M., Keeney, B. K., Rodewald, P. G. & Schulenberg, T. S. (eds.), Birds of the World. Cornell Lab of Ornithology, Ithaca, New York. https://doi.org/10.2173/bow.bubcur1.01.
- Gill, F., Donsker, D. & Rasmussen, P. (eds.). 2026. IOC World Bird List, version 15.2. International Ornithologists’ Union. Available at: https://www.worldbirdnames.org/new/ (accessed 8 September 2026).
- Ochoa-Quintero, J. M., Melo-Vásquez, I., Palacio-Vieira, J. A. & Patiño, Á. M. 2021. Nuevos registros y notas sobre la historia natural del paujil colombiano Crax alberti al nororiente de la Cordillera Central Colombiana: New distributional records and natural history notes on the Blue-billed Curassow Crax alberti in the northeastern Central Andes of Colombia. Ornitología Colombiana, 3, 42–50. https://doi.org/10.59517/oc.e52.
- Valencia, I. F., Kattan, G. H., Valenzuela, L., Caro, L., Arbelaez, F. & Forero-Medina, G. 2023. Evaluation of alternative conservation strategies for the blue-billed curassow Crax alberti in the Middle Magdalena Valley, Colombia. Oryx, 57(2), 239–247. https://doi.org/10.1017/S0030605322000060.
- Conservation Breeding Specialist Group. 2015. Conservation Breeding Specialist Group 2015 Annual Report. Species account and conservation-planning summary for the Blue-billed Curassow Crax alberti. IUCN Species Survival Commission. Available at: https://www.cpsg.org/sites/default/files/2024-05/2015_CBSG_Annual_Report.pdf (accessed 8 September 2026).
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