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Nestling peregrine falcons, 29 days old, with no down on the sides of the head, down remaining on top of head, significant dark back feathering, and some breast feathering. These nestlings hatched less than 24 hours apart, but the one on the right shows noticeably less down on its head. © David A. Ponton, [photo by motion-activated camera, low-resolution limits repro. size]
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© David A. Ponton
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PEREGRINE FALCON NESTLING DEVELOPMENT
Nestling peregrine falcons, 29 days old, with no down on the sides of the head, down remaining on top of head, significant dark back feathering, and some breast feathering. These nestlings hatched less than 24 hours apart, but the one on the right shows noticeably less down on its head. © David A. Ponton, [photo by motion-activated camera, low-resolution limits repro. size]