Peregrine Falcon (Falco peregrinus), The Birds of North America Online (A. Identification and protection of critical habitats subject to. Florida Fish and Wildlife Conservation Commission. Arctic Peregrine Falcon - Natureserve Global Rank: T3: Recovering from population decline.No seasonal variation in plumage other than muted or lessening of colors as feathers wear, but bare parts of male brighter in breeding season. Females also more heavily marked below on average than males. The wings and tail are bluish-gray, while the back and head are a darker brown. Sexes best distinguished by size, with females larger and heavier than males normally no size overlap between sexes within a given subspecies. Peregrine falcons can be hard to identify because of their quick flight and camouflage coloring. One of the worlds fastest birds in power-diving from great heights to strike prey, the Peregrine may possibly reach 200 miles per hour. Immature similar but upperparts vary from pale to slate or chocolate brown and underparts buffy with blackish streaks. Medium to large falcon, with bluish-gray upperparts (becoming more blackish on head) in adults, variable-width blackish facial stripe extending down from eye across malar, this stripe usually set off by pale auriculars or "cheek," but pattern sometimes obscured if cheek all dark underparts whitish, grayish, or buffy with variable amount of blackish spotting and barring under wing and under tail surfaces barred pale gray and black.
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