Rhamphorhynchus was a fairly large pterosaur. It had a very long snout full of long sharp teeth that were probably used to catch fish. Unlike some pterosaurs, Rhamphorhychus did not have a bony crest on its skull. It had a very long tail stiffened by ligaments. The end of the tail had a diamond-shaped vane that helped the animal steer as it flew through the air, a bit like a rudder. Although large adults had a wingspan of nearly six feet, hatchlings with wingspans of as little as one foot have also been found.