The Canadian Peregrine Foundation

Peregrine Age Guide - Day 30

(Photo courtesy of the Kodak Birdcam, Rochester NY)

It's often around day 30 that the chicks seem to turn into "real" peregrines almost overnight, very rapidly losing much of the down on their breast, thus revealing the heavily streaked breast feathers they will be carrying for the next year. 

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Canadian Peregrine Foundation