For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

Scientists have recently mapped the painted lady butterfly's annual flight from equatorial Africa to northern Europe and back ...

Hummingbird Central has released an interactive migration map so birdwatchers can keep track of when these tiny travelers ...

Hummingbirds are a fan favorite among birdwatchers, and for good reason — they're playful, energetic and tiny (which makes ...