How do birds know when to fly south?

Introduction References & Edit History Related Topics

Images

Five Canada Geese flying in a V formation against a blue sky with scattered clouds during migration.

How do birds know when to fly south?: Media

Images

Five Canada Geese flying in a V formation against a blue sky with scattered clouds during migration.

Migrating geese

A flock of Canada geese fly in a V-formation during migration.

© Scol22/Dreamstime.com