New research shows mountain birds move up and down slopes to save energy, find food, and avoid competition across seasons.

New research shows how physical changes in the skull affected the mechanics of the way birds move and use their beaks to eat and explore their habitats -- adaptations that helped them evolve into the ...

Spring migrations runs between March 1 and June 15. Fall migration runs between August 1 and November 30. Peak spring migration is in April. Birds are on the move as their annual spring migration ...