Which birds hardly ever land?

 

 

                     Swifts and frigate birds spend almost all their life in the air. They never walk on the ground, because the length of their wings would stop them from taking off again. Swifts rest by clinging to a vertical surface and they then launch themselves into the air. Frigate birds are large seabirds that sleep on the wing, using only a section of their brain to keep flying.