When smaller birds join forces to ward off larger birds, it's called, "mobbing."

This behavior--like calling your family for help--is used by many bird species.

The best time to observe mobbing is in spring and early summer, when breeding birds are trying to protect their nests and young.

Birds, like swallows, blackbirds and the American Crow will mob Red-tailed Hawks (pictured), as they know there is strength and power in numbers, and they've learned to join forces to protect themselves.

See a video of mobbing here! And learn more at BirdNote.org.