This “Yellow-shafted” Northern Flicker has reddish feathers after eating invasive honeysuckle berries. Christopher F. Hansen

Mystery Solved: Invasive Berries to Blame for Turning Flickers’ Feathers Pink

— An old theory distracted researchers from the real cause for decades, but a new study points to a non-native species of honeysuckle as the culprit.

Half of North American Birds Are at Risk

— Audubon's Birds and Climate Change Report shows that climate change threatens about half of North American birds.

Rigged Decks

— Is the Gulf of Mexico a haven or a minefield for birds?

Are Brightly Colored Males Really the Best Mates?

— New research is questioning one of the most accepted theories about bird feathers and sexual selection.

Why Do Birds Masturbate?

— Tom Price aims to answer an unorthodox, and little-studied, question about avian behavior.
In close quarters, Tree Swallows huddle up with their companions. But according to a new study, it may be more about convenience than affection. Katherine Westover/Audubon Photography Awards

Feathered Friends for Life—or Not

— Birds make new pals when circumstances force it, but don't expect them to buddy up for the long haul.