what is the only mammal that can fly

The only mammal that can truly fly is the bat. Bats belong to the order Chiroptera and are the only mammals capable of powered, sustained flight. Unlike other mammals such as flying squirrels or colugos that can only glide, bats use their forelimbs modified as wings to fly freely with control over their movement in the air. There are over 1,400 species of bats worldwide, and they make up about 20% of all classified mammal species.