Answer the following question given this paragraph: 

One type of migration that you are probably familiar with is the migration of birds. Maybe you have heard that birds fly south for the winter. In the fall, birds fly thousands of miles to the south where it is warmer. In the spring, they return to their homes. ( Figure below ).


Q: Birds flying thousands of miles south in the winter, then returning to their homes in spring, is a familiar example of what?

 Choices:

- hibernation

- evacuation

- emigration

- migration

A:
migration
