Were pterodactyls dinosaurs

Pterodactyl was not the only flying dinosaur. They are not even considered dinosaurs. They are however, condsidered the first flying vertabrates. Other than the Pterosaurs there was Tropeognathus, Quetzalcoatlus (the largest), Pterodaustro, Pterodon, Ornithodesmus, Ctenochasma, and many more.

There were also animals that were adapted for gliding and soaring rather than the bird-like flying we think of today.

However modern birds are considered to be flying dinosaurs.

Answer2: Reptiles That Fly

One intriguing type of ancient reptile was the pterosaur ("winged lizard"), which includes the pterodactyl ("winged finger"). But these were not dinosaurs, nor were they birds. They were flying reptiles and are classified with other reptiles such as dinosaurs and crocodiles. Some of them had wingspans of 25 feet [8 m]. One discovered in Texas in 1975 indicates that some had wingspans of more than 50 feet [15 m]. These were perhaps the largest animals ever to fly.

While pterosaurs had the teeth, skull, pelvis, and hind feet of a reptile, they in no way resembled the reptilian dinosaurs. And while they appeared to be a bird with stiff aerodynamic wings, they were much different. Like birds, the pterosaurs had hollow bones and few flexible joints in wings and ankles. However, a bird's wings use feathers rather than a membrane as was the case with the pterosaurs. And the fourth finger of the pterosaur forelimb extended to support the wing membrane. In the bird the second finger is the principal support of the wing.