Truly impressive birds, Harpy Eagles' legs are as thick as a person's arm and their talons are three to four inches long — the same size as a grizzly bear's claws! They are the heaviest raptors of the Americas. A likely explanation for this is that by being different sizes the male and female are not competing for the same prey. Size: average size between 60-70 cm: the average size of 30-35 cm. As is the case with many birds of prey, the female harpy eagle is larger than the male. Known as cast. 20. They have a body length between 89 and 100 cms (35 - 39 inches), a wingspan of approximately 2 m (6.6 ft) and they weigh between 4 and 9 kgs (8.75 - 20 lbs). Types: Steller’s Sea Eagle, Philippine Eagle, Harpy Eagle and Martial Eagle. As far as weight of Harpy Eagles are concerned, a male Harpy usually weighs between 4 and 4.8 kilograms or 8.8 and 10.6 lbs. This eagle is one of the few diurnal (day-hunting) raptors that have a facial disc, a trait they share with owls such as the Crested Owl . Female Harpy Eagles on the other hand weigh anywhere between 6 and 9 kilograms or 13 and 20 lbs. Harpy Eagle Size. 21. Harpy Eagles can grow anywhere between 2’10” and 3’6” in length. The Harpy Eagle is a powerful bird of prey. Harpy eagles are well known for their large size. Groups: Known as convocation. Life Span: 30 years: 15 years: Eggs: 2 in their lifetime. Interesting Harpy Eagle Facts: 21-30. 5 in their lifetime. Goshawks, Sparrowhawks, Duckhawks, Fishhawks and The Sharp-Shinned Hawk.