Pterosaurs, which means winged lizard in Greek, are often referred to as flying dinosaurs, but they aren't actually dinosaurs.
They're an extinct group of flying reptiles that ruled the skies starting 225 million years ago. Still, they're more closely related to birds and dinosaurs than they are modern reptiles. And they were also the first vertebrae to leave land and take to the skies.
The Evolution of Pterosaurs
(Credit: Akkharat Jarusilawong/Shutterstock)
