Animals use special clues from their environment to know when to start migrating. For example, some birds feel the days getting shorter and know it's time to fly south for winter. Like a clock in their bodies tells them when to go.
Examples
- A bird feels the days getting shorter and knows it's time to fly south.
- A salmon smells the river where it was born and starts swimming back.
- A butterfly wakes up when the temperature rises and begins its journey.
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See also
- How Do Animals Migrate Across the World?
- How Do Animals Migrate in the Wild?
- How Do Animals Migrate Across Oceans?
- How Do Birds Know the Time of Year?
- How Do Bees Know Where to Go When They Fly?
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