Pteranodons were large flying reptiles that lived during the Cretaceous period. They were not dinosaurs but related to dinosaurs. They have a large beak and a long crest above their heads. They have a long fourth finger that makes up the wing. Their bones are hollow which helps them to fly. They may have lived by seaside cliffs to use the wind to glide. Their favorite food is fish. The most notable Pteranodon is the Pteranodon family. They lived near the Western Interior Sea in North America.