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.
See also
- How Can a Single Seed Grow into a Tree?
- Why Do We Blink?
- How Do Birds Migrate So Far?
- What Causes Hiccups?
- What Causes the Color of Leaves?
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Categories: Biology · bird migration· animal behavior· biological clocks · Text is available under the Creative Commons Attribution-ShareAlike License.