Behavior
Golden Eagle Lifting Off and Flying Through the Snow
clip 0:58
AnatomyEvolution
Ribbon-tailed Astrapia: The Three-Foot Tail
video 2:17
Bird_Biology-contour_feather_illustration_side
AnatomyFeathers
How Feathers Are Built
Interactive Feature
Feathers
Feather Biology Slide Collection
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Bird biology birding by size and shape
AnatomyBird ID
Inside Birding: Size & Shape