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The Canadian Peregrine Foundation - Peregrine Falcon development

The Canadian Peregrine Foundation

Peregrine Age Guide - Day 22


(Photo courtesy of the Kodak Birdcam, Rochester NY)

The two chicks are both approximately 22 days old in this photo.  Looking at the one on the left, the amount of black protruding along the edge of the wing indicates that the flight feathers continue to develop at a rapid rate, but it isn't until the wing is spread that the state of development can be fully appreciated.  This view reveals that the primaries are barely emerging from their shafts, while the secondaries are already considerably more advanced. 

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Canadian Peregrine Foundation