Question

Why Migratory birds leave their place at particular time duration and migrate to

other places.​

Answer 1

Answer:

The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. Also, the longer days of the northern summer provide extended time for breeding birds to feed their young.

Answer 2

Answer:

As they can't tolerate cold and go to warmer places