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.

Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north.

High fledgling survival in American Kestrels suggests adult mortality and migration risks may better explain their population ...

Imagine looking up at the sky on a crisp autumn evening, only to witness a swirling river of birds soaring overhead—thousands ...

John Dowd, Editor After COVID-19, the world is understandably paranoid about the risks of viruses affecting the human ...

From Mexico to the mountains, Arizona’s hummingbirds are on the move. Here's when and how to spot them in Arizona.