The term "Swimmer", within The Land Before Time franchise, is used to refer to types of creature with relation to water. Saurolophus (Ducky's species) are often called Swimmers. In the first movie, Bigmouth was also used. It is unknown whether other species of hadrosaurs would be called Swimmers, but as they are almost never seen in water, it can be safe to assume they are not. All sea creatures (including Elasmosaurus, Ophthalmosaurus, any type of fish, and sea turtles such as Archelon) are also called Swimmers. Swimmers with sharp teeth are called Swimming Sharpteeth.