The harpy eagle (also featured in our list of animals that start with H) is the most powerful bird of prey in the world. The bald head eagle is its closest competition for the world's strongest bird. Harpy eagles are 3 to 3.5 feet long, with a wingspan of 6.5 feet. They weigh about 9 to 20 pounds.

Harpy eagles fly easily in their canopy habitat in pursuit of prey. They prey on snakes, monkeys, macaws, sloths, and other large tree-dwelling animals. The legs of the harpy eagle are as thick as a human, and its four-inch talons are the same size as that of a grizzly bear.