Claudio Mello was conducting research in Brazil’s Atlantic Forest about 20 years ago when he heard a curious sound. It was high-pitched and reedy, like a pin scratching metal. A cricket? A tree frog?

Anna's hummingbird flying in the experimental setup, drinking sugar water from a fake flower. Credit: Lentink Lab / Stanford University. Anna's hummingbird flying in the experimental setup, drinking ...

Hummingbirds are returning to the U.S. as the weather warms. Learn how to spot them in New Jersey and attract them to your ...

During the late summer and early fall, hummingbirds will migrate back to warmer weather after arriving in the Midwest earlier this spring. Bird-watchers can expect to see hummingbirds — the tiny birds ...

That annual northern mass migration of hummingbirds has begun, with the colorful birds already reaching North Carolina.