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Juveniles make bird identification tricky this time of year – Orange County Register
Plumage - Wikipedia
A Guide To Bird Feathers - Avian Report
Bills' shapes - Page 5
Bills' shapes - Page 5
Flights of fancy: the evolution of plumage patterns in male and female birds
Wild Bird: Understanding Colorful Birds
Bills' shapes - Page 3
Mates or survival: Which explains a bird's color?
Overview of Peacock Feathers - Peacocks UK
Description of the bird and its plumage