The Arctic is particularly vulnerable to climate change, but efforts to tackle it risk alienating the people who live there.

Cities are danger zones for migrating birds, but there are ways to help feathered visitors pass through more safely

Geese honk loudly and point their bills toward the sky when they're ready to start the migration. Here's how they know it's time, how they navigate and how they conserve energy on the grueling trip.

Climate migrants still tend to move to places they know or have connections to through their social networks.

Rising sea levels may trap more people than are displaced.

Can a plan that brings together government and private landowners create enough habitat for monarch butterflies?

Biometric data is being used to target those deemed unwanted aliens.

Extreme weather events prompt people to move, a trend that could accelerate in a warming climate. But the ability to migrate internally in the US depends largely on economic status.