Some Pteranodons (the most famous of the Pterosaurs along with Pterodactylus) were about the size of a giraffe. Most scientists believe that pteranodon was primarily a glider, and didn't actually flap its wings too often, if at all.
EDIT: Oops, I have just been informed that the above picture is a Quetzalcoatlus, which was the largest of the pterosaurs. Thank you, perpetualartistsblock, and dear god, I hope I don't fail my quiz tomorrow.














