Swifts and Swallows
Swifts and swallows are birds that spend most of their time in the air. They are found throughout the world. Swifts have long, narrow wings. Spine-tailed swifts of Asia can fly as about 100 miles per hour (161 kph). Swifts spend all of their time in the air or clinging to vertical surfaces. They eat only insects, and they feed and mate in the air.
Swallows are also insect-eating birds that feed in the air. When no insects are available, swallows eat berries. Swallows have long, pointed wings and, usually, forked tails. Like swifts, they spend most of their time flying.