Evolution

Monkeys and sloths fear this bird. Because it rips them right out of the trees.

The harpy eagle (Harpia harpyja) is one of the largest and most powerful birds of prey. Its wingspan can reach 7ft (a little over 2m) and the female can weigh up to 20lbs (9kg). Females are larger than males, which can reach 12lbs (5.4kg). Its talons are about 5 inches (13cm) long, rivalling a grizzly bear's claws. It can be found in the tropics from southern Mexico to southern Brazil.

Photo courtesy of:

http://www.royle-safaris.co.uk/harpy-eagle-specialist-tour-2637/

Sources:

http://www.sandiegozoo.org/animalbytes/t-harpy_eagle.html