Other birds that can capture food in flight also migrate during the day. Examples of these birds include swifts and swallows. Birds such as sparrows and warblers are nocturnal migrants and travel at night. They feed and rest during the day and fly great distances at night. For small birds migration is very difficult.
Scientists think that only about half of the small songbirds survive migration.
The third type of migration is altitudinal migration. Birds and animals which live high up in the mountains during the warm summer weather travel down the mountain in the fall. Some birds complete this migration in a few minutes. Different species of birds have unique ways of making the long migration trip easier. Birds like eagles, vultures, and storks use a soaring technique.