When birds fly South for the winter it is called migration.
migration
The main reason that birds fly south in the winter is because they can't stay in a cold place so they fly south to a warmer place during the winter.
Monarch Butterflies. They fly south for the winter like birds do.
Migration
Many birds fly south for the winter this adaptation is called
It's warm
yes it is called migration that is when a animal goes somewhere to be safe from the cold
They don't stay when it is snowing. Hasn't anybody learned that birds fly south in the winter?
Instinct
No. Only some species are migratory.
They fly to find better food supplies (and better weather).