Did you know? Harpy Eagles are among the world’s largest and most powerful eagles. Their rear talons are about 3-4 inches long – the same size as a grizzly bear’s claws! Like many other birds of prey, Harpy Eagles continue to bring fresh green twigs and branches to the nest after the chick has hatched. Some researchers think this helps keep insects and parasites away and provides a cooler environment for the nestling. A female can weigh up to two times more than her mate. Deforestation and shooting are the two main threats to the survival of Harpy Eagles (pereginefund.org).