No. Only some species are migratory.
When birds fly South for the winter it is called 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
migration
Migration
It's warm
They don't stay when it is snowing. Hasn't anybody learned that birds fly south in the winter?
Birds do not fly all the way to the southern hemisphere, they fly to the equator.
Instinct
They fly to find better food supplies (and better weather).
Yes, many birds migrate south for the winter to find warmer temperatures, abundant food, and suitable nesting grounds. This behavior helps them survive the harsh winter conditions in their breeding grounds.