The holotype of putative species C. annulata has been determined to be a female blue-billed curassow.

[3][4] The blue-billed curassow is 82.5 to 92.5 cm (2.7 to 3.0 ft) long and weighs 3.2 to 3.6 kg (7.1 to 7.9 lb).

[4] The Serranía de las Quinchas area in the Magdalena Valley is home to the last viable population of blue-billed curassows.

[8] The blue-billed curassow's breeding season spans from mid-December to early March.

It builds a large nest of sticks and dead leaves and conceals it in dense vine tangles.

[1] The ProAves El Paujil Bird Reserve in Santander Department was created in 2003 especially to protect one population.

[10] Studied populations are not estimated to survive another 100 years as hunting has the greatest impact on the expected extinction date.

Fish and Wildlife Service to add the blue-billed curassow to the Endangered Species Act.

[10] Agreements have already been signed with property owners in San Bartolo, La Ganadera, and Rancho Verde ranches to guarantee forest protection and no hunting within their boundaries.