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Ospreys have long narrow wings, dark brown upperparts, white underparts, a white head with a prominent dark eye streak, and dark wrist patches (visible in flight) on the underside of the wings. Immatures have pale buff edging on the dark feathers of the upper surface. Females are more likely than males to have a necklace of dark streaking. Average length 56-64 cm, wingspan 147-183 cm. Source: ...

A medium-sized falcon with pointed wings, a hooked bill, and conspicuous (in flight) dark patches near the body on the underside of the wings (axillaries and coverts); adults are pale brown above, whitish with heavy spotting below; head has narrow dark streak extending downward from each eye; immatures are buffy below; average length 39-50 cm, wingspan 89-109 cm (NGS 1983). Source: Encyclopedi...