About Chamaepetes unicolor Salvin, 1867
The black guan (Chamaepetes unicolor Salvin, 1867) measures 62 to 69 cm (2.03 to 2.26 ft) in length and weighs approximately 1,135 g (2.502 lb). Adult individuals have entirely black plumage, with bright blue facial skin that contrasts sharply with their red eyes. Their legs and feet are pinkish-red. Juvenile black guans are similar in appearance to adults, but their plumage is less glossy, their underparts are browner, and their facial skin is blackish or dark brown. Black guans range from the Cordillera de Guanacaste in northern Costa Rica to western Coclé Province in Panama. They live in cloudforest within the Talamancan montane forest ecozone. They prefer steep terrain in temperate, subtropical, and tropical zones, and most are found between roughly 1,000 and 2,250 m (3,280 and 7,380 ft) of elevation. In some areas they occur as low as 800 m (2,600 ft), and in others as high as 3,000 m (9,800 ft).
