Delve deeper into special topics through Interactive Features and in depth articles.

Biology
Bird Academy's A-to-Z Glossary of Bird Terms
ABCDEFGHIJKLMNOPQRSTUVWXYZ A abdominal air sacs A pair of air sacs in the abdominal region of bi...
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Biology
Avian Vocal Behavior—Sound Visualizations
Throughout this chapter you will find references to songs and calls that will help you understan...
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Conservation
How Hunters and Artists Helped Save North America’s Waterfowl
Be a part of the Duck Stamp success story.
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AnatomyFeathers
How Birds Make Colorful Feathers
The colors in the feathers of a bird are formed in two different ways, from either pigments or f...
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Feathers
Bird Plumage Variations and Abnormalities
Variations in plumage can be based on the sex of the bird, its age, or seasonal changes caused b...
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Bird IDSongs + Calls
Behind the Scenes of Birds Got Swing
Last April, just as the birds were flowing into Central Park on their spring migration, I had th...
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Songs + Calls
How and Why Birds Sing
birds!
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Songs + Calls
Anatomy of Bird Song Slides
See the songbird syrinx in action and animate one of the most complex trills in the bird world w...
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Songs + Calls
Bird Song Visualized Slides
Learn to “see” and better understand bird song with the Bird Song Visualized Slide C...
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Feathers
Feather Biology Slide Collection
From animated views of feather microstructure to step-by-step diagrams of the feather growth pro...
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Feathers
Everything You Need To Know About Feathers
Unique to birds and their dinosaur ancestors, feathers have evolved into impressive biological s...