Although we all know what we mean when we think of a reptile, reptiles don't exist in a technial sense unless one is willing to put the mammals, birds, and dinosaurs in with them.
Birds are just feathery, flying dinosaurs in the opinion of most vertebrate paleontologists.
Never the less, they are here too. This is a wonderful part of a larger site on dinosaurs that features descriptions and figures of non-dinosaurs that are commonly grouped with the dinosaurs in discussions. Some of the major dinosaur sites also have information about these marine reptiles even though they are not dinosaurs. Oceans of Kansas Paleontology . A marvelous web site dealing with the ancient ocean life that inhabited the seas of the Cretaceous where Kansas now stands.