Harpy eagles mainly eat mammals that dwell in trees, including monkeys, sloths and opossums. Less often, they eat reptiles like iguanas. They also sometimes prey on macaws and other birds, according to PBS.
The harpy eagle is one of the largest eagle species, and its size makes it capable of capturing fairly large prey. As with many birds of prey, the female of the species is larger than the male. She generally hunts larger prey, whereas the smaller harpy male targets smaller prey.
The hunting grounds of the harpy eagles are the rain forests of Central and South America where they can enjoy large expanses of uninterrupted forest. They stay mostly hidden in the forest canopy, rarely flying in the open.