Question

why do birds move to different regions when the season change​

Answer 1

Answer:

Birds migrate to move from areas of low or decreasing resources to areas of high or increasing resources. The two primary resources being sought are food and nesting locations. ... As winter approaches and the availability of insects and other food drops, the birds move south again.

Answer 2

Answer:

Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations. As winter approaches and the availability of insects and other food drops, the birds move south again.