sentences:  A "Protoceratops" and a "Dimetrodon" ("Dimetrodon" is not actually a dinosaur, but rather a synapsid, and more closely related to mammals than reptiles) were added later on and are located near the gift shop and parking lot.With the exception of the "Protoceratops", the dinosaurs they selected were based on fossils found in South Dakota and the Western United States.The dinosaurs were constructed out of 2 inch (5.08 centimeters) black iron pipe, with a wire mesh frame and a concrete skin.