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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 (NGS 1983). Source: Encyclopedia of Life

A small falcon with pointed wings, a strongly barred tail, a hooked bill, and heavy streaking below; upperparts are gray-blue in males, dark brown in females; overall, plumage is much darker in the Pacific Northwest than in central Canada and the Midwest; average length 31 cm, wingspan 64 cm (NGS 1983). Source: Encyclopedia of Life