birds
bats
neither
Correct!
Pterosaurs were their own group distantly related to other reptiles. However, they were more closely related to birds than to bats.
pterosaurs
The first vertebrates to fly took to the skies about 215 million years ago. These creatures were neither birds nor bats. They belonged to a group of flying reptiles called pterosaurs. Pterosaurs ranged from the size of a sparrow to a small airplane, and are still the largest animals that ever flew. Along with dinosaurs and many other species, pterosaurs went extinct about 65 million years ago.