Protoceratops lived 80 million years ago during the Cretaceous period. Many fossils have been discovered in Mongolia. This is where most of them are believed to have lived. A fossil of a Protoceratops and a Velociraptor were found together in Mongolia, and it is believed that they were fighting. Pterodactyl translates to winged lizard. Dinosaur refers to animals that walk on land. The pterodactyl was a mammal, but it was a flying reptile. Their wings were attached to the fourth finger of their arms. Sometimes their wings were 40 feet long. They lived in trees and caves near the sea. They ate large insects. They flew very quickly thanks to the tough fabric that covered their arms. They are believed to have been the only flying reptile alive during the age of the dinosaurs. Their wings were not like those of birds. They had 4 toes, and 3 of them came down halfway up the wing. The 4th finger went to the tip of the wing. The pterodactyl lived in the Cretaceous and Jurassic periods. Their fossils have been found throughout Europe, North America, Australia and