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A very large raptor with mostly brown plumage, a golden wash on the back of the head and neck, and a mostly horn-colored bill; tail is faintly banded; immatures have white at the base of the primaries and and white tail with a dark terminal band; total length 76-102 cm, wingspan 203-224 cm (NGS 1983). Source: Encyclopedia of Life

Pointed wings, reddish back and tail, two black stripes on each side of white sides of head; male has blue-gray wings; averages 27 cm long, 58 cm in wingspan (NGS 1983). Source: Encyclopedia of Life

A falcon with long pointed wings, a dark crown and nape, and a dark wedge extending below the eye; forehead is pale in immature, which are mainly brownish above rather than black or gray as in adults; arctic birds are relatively pale, and peregrines of the northwest coast of North America are very dark, compared to the intermediate coloration of the subspecies (ANATUM) that once ranged across No...