Great Egret (Ardea alba)
Photo: © 2004 Jeff Berger
For the great egret, the breeding season begins when hormones cause the bare skin around the beak and eyes to change from yellow to green. The male builds a makeshift nest and invites a female to cohabitate thus signaling courtship. The nuptial pair announce their reproductive readiness by crossing beaks and fluffing up their feathers.
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