How do birds know when winter is coming?
Many bird species migrate when winter is coming. They are called migratory birds. They migrate to locations near and far to find food, to find nesting grounds, to return to breeding colonies, to find new places if their habitat is damaged or destroyed, to escape predators, or for other reasons.
The birds that do not migrate are called residential birds. They stay in the same location and prepare themselves for winter.
Birds need to know when winter is coming so that they can start their migration, protect themselves from winter storms, start hoarding food for the coming winter, or fluff-up their feathers to protect themselves from the winter chill.
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