Pterosaurs are often found in regions where dinosaurs and other prehistoric creatures are commonly encountered, yet they are not dinosaurs themselves. The pteranodon is the most well known and widespread of these flying reptiles, but numerous other species exist, such as the relatively small rhamphorhynchus, the venomous dimorphodon, and the lumbering, giraffe-sized quetzalcoatlus. While the larger pterosaurs are awkward fliers, the smaller ones can be quite agile and quick. Pterosaurs generally dwell on coastlines, along rivers, or near swamps or lakes, for the majority of their diet consists of fish snatched from the water in daring dives. Pterosaurs are quite territorial, though, and most won’t hesitate to swoop down and hiss, shriek, and attack things their size or larger.