Birds have a special clock inside them that tells them when to go on their big trip. It works like a built-in calendar, and it helps them know when the seasons are changing. When it gets colder, they get the signal to fly somewhere warmer.
Examples
- A robin feels the days getting shorter in fall and knows it's time to fly south.
- A goose hears the snow coming and starts preparing for its journey to a warmer place.
- A sparrow senses colder air and decides it's time to leave the city.
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See also
- How Do Birds Migrate So Far Away?
- How Do Birds Migrate Thousands of Miles Without Getting Lost?
- How Do Animals Migrate Across the World?
- How Do Animals Know When to Migrate?
- How Do Animals Migrate in the Wild?
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