Crested Eagle has a broad diet of various arboreal and terrestrial prey. In one nest near Manaus, Brazil, Bierregaard (1984) noted the following prey items over the course of several months: six snakes, three of which were emerald tree boas (Corallus caninus), one unidentified frog, and eight small mammals, two of which were kinkajous (Potus flavus), the others were likely myomorpha or hysticomorpha rodents or marsupials. Also noted was the attempted take of a Gray-winged Trumpeter (Psophia crepitans). In Brazil, Crested Eagles have been observed sitting in ambush under fruiting trees and waiting for guans and trumpeters to come to feed (Sick 1993). Crested Eagles have also been seen attacking Guianan Cock-of-the-rock (Rupicola rupicola) (Bierregaard 1994). Other regular prey items include monkeys, other arboreal mammals (including opossums and squirrels), iguanas, and birds (Brown and Amadon 1968). Oversluijs Vasquez and Heymann (2001) report two successful attacks of Crested Eagles on juvenile tamarin monkeys (Saguinus mystax and Saguinus fuscicollis) in Peru. Similarly, Crested Eagles have been known to prey on juvenile spider monkeys (Ateles paniscus) in French Guiana (Julliot 1994).