- Order: Accipitriformes
- Family: Accipitridae
Juvenile Black-and-chestnut Eagle. Cajanuma, Podocarpus NP, Loja province, Ecuador; © Nick Athanas
The Black-and-chestnut Eagle is a very large raptor, closely allied with the similar hawk-eagles (Spizaetus) of the lowlands. This eagle is endemic to the humid montane forests of the Andes from Venezuela to Bolivia. It is a very dark species, being primarily black with a deep chestnut breast, tarsi and vent. At lower elevations, it may narrowly overlap with the lowland hawk-eagles, where it would be most easily confused with Black Hawk-Eagle, but note its chestnut underparts, larger size and distinctive tail pattern. The Black-and-chestnut Eagle feeds on large birds, such as cracids, and on arboreal mammals, ranging in size from squirrels to monkeys, especially Woolly Monkeys (Lagothrix).
. 2010. Black-and-chestnut Eagle (Spizaetus isidori), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=22334