So tiny and secretive during nesting season, a hummingbird building a nest and raising chicks is something most people will never see.

How the fluttering feathers of some hummingbird species generate courtship sounds.

Experiments show that hummingbirds suffer few energy costs when they grow long tails.

The source of the noise which the Anna’s hummingbird emits has been a long-lived topic of debate among ornithologists. This particular species of hummingbird, which is native to the West Coast of the United States, makes a loud, brief chirp when he dives to impress female hummingbirds and entice them into mating.

By RANDOLPH E.