Description
The upper side of the Harpy Eagle is covered with slate black feathers, and the underside is mostly white, except for the feathered tarsi, which are striped black. There is a broad black band across the upper breast, separating the gray head from the white belly. The head is pale grey, and is crowned with a double crest. The upperside of the tail is black with three gray bands, while the underside of it is black with three white bands. The iris is gray or brown, the cere and bill are black or blackish and the tarsi and toes are yellow. The plumage of male and female is identical. The tarsus is up to 13 cm (5.1 in) long.
Female Harpy Eagles typically weigh 6 to 9 kg (13 to 20 lb). One exceptionally large captive female, "Jezebel", weighed 12.3 kg (27 lb). Being captive, this large female may not be representative of the weight possible in wild Harpy Eagles due to differences in the food availability. The male, in comparison, is much smaller and weighs only about 4 to 4.8 kg (8.8 to 11 lb). Harpy Eagles are 86.5–107 cm (2 ft 10 in–3 ft 6 in) long and have a wingspan of 176 to 224 cm (5 ft 9 in to 7 ft 4 in). Among the standard measurements, the wing chord measures 54–63 cm (1 ft 9 in–2 ft 1 in), the tail measures 37–42 cm (1 ft 3 in–1 ft 5 in), the tarsus is 11.4–13 cm (4.5–5.1 in) long and the exposed culmen from the cere is 4.2 to 6.5 cm (1.7 to 2.6 in). It is sometimes cited as the largest eagle, however the Philippine Eagle is somewhat longer on average and the Steller's Sea Eagle is slightly heavier on average. The wingspan of the Harpy Eagle is relatively small, an adaptation that increases maneuverability in forested habitats and is shared by other raptors in similar habitats. The wingspan of the Harpy Eagle is surpassed by several large eagles who live in more open habitats, such as those in the Haliaeetus and Aquila genera. The extinct Haast's Eagle was significantly larger than all extant eagles, including the Harpy.
This species is largely silent away from the nest. There, the adults give a penetrating, weak, melancholy scream, with the incubating male's call described as Wheeeeeeeeee-wheeeeeee-wheeeeeeeee. The females calls while incubating are similar but are lower pitched. While approaching the nest with food, the male calls out "rapid chirps, goose-like calls, and occasional sharp screams". Vocalization in both parents decreases as the nestlings age, while the nestlings become more vocal. The nestlings call Chi-chi-chi...chi-chi-chi-chi, seemingly in alarm in respond to rain or direct sunlight. When humans approach the nest, the nestling have been described as uttering croaks, quacks and whistles.
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