Yes, birds can see color and this site delves into pigmentation, color abnormalities, and structural colors of birds' feathers.

This site provides a detailed explanation of the structure of bird feathers. Topics include feather topography, types of feathers, and feathers and flight.

Why do birds molt? How many times a year do they molt? When do birds molt? These questions and more are answered on this comprehensive site.

Striking photos are presented in this colorful site that show the molting stages of the Calliope Hummingbird.

Plumage variations can be based on a number of factors. This brief but informative examines single plumage patterns, seasonal variations, and sexual dimorphism.