Question

what is the scientific reason behind birds migration

Answer 1

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.

Answer 2

some birds live in same habitat throughout the year .other birds which don't have permanent nestlings join into small flocks and move from one region to the other for food shelter called migration and such birds are called migratory birds.... pls add as best plllsssss