How big, strong and fast is a Harpy Eagle?
The Harpy Eagle (Harpia harpyja) is the largest and most powerful bird of prey in the Americas, with a wingspan of about two metres, a female weight of up to roughly 9 kg, and rear talons near 13 cm long. Below are the numbers, with the context behind them. For the full profile, see our Harpy Eagle guide.
How big is a Harpy Eagle?
Body length runs about 86 to 107 cm (34 to 42 inches), with a wingspan of roughly 176 to 224 cm — close to two metres. Interestingly, its wingspan is not the widest among eagles; the wings are deliberately shorter and broader than an open-country eagle's, an adaptation for steering between rainforest trees rather than soaring above them.
How heavy is a Harpy Eagle?
This is where the Harpy Eagle excels. A large female can weigh up to about 9 kg, placing it among the heaviest eagles alive, while males are much lighter at around 4 to 6 kg. That difference between the sexes is one of the most extreme of any raptor.
How strong is a Harpy Eagle?
Strength, not size, is the Harpy Eagle's defining trait. Its rear talons reach roughly 13 cm — about the length of a grizzly bear's claws — set on legs as thick as a human wrist. That grip lets it seize and lift prey approaching its own body weight, crushing the bones of sloths and monkeys as it strikes. Popular grip-strength figures of several hundred pounds per square inch circulate widely, but these are estimates rather than carefully measured values, so the safest statement is simply that the grip is powerful enough to kill mid-sized mammals on impact.
How fast is a Harpy Eagle?
Harpy Eagles are reported to reach around 50 mph (about 80 km/h) in short bursts as they accelerate toward prey through the canopy. They are not long-distance speed specialists like the diving peregrine falcon; their advantage is explosive acceleration and agility in tight forest, launching from a perch and closing the gap before the prey can react.
Why these numbers matter for conservation
A predator this large needs vast areas of intact forest and a steady supply of canopy mammals, which is exactly what deforestation removes. WARN's local partners in Brazil and Colombia focus on keeping nesting forest standing and caring for injured or confiscated birds; our habitat protection appeal explains the work.
Read the full Harpy Eagle wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
