It probably walked in a quadrupedal position

was a flightless bird endemic to the island of Mauritius in the Indian Ocean that became extinct during the 17th century

characterized by its large size and a distinctive feature: a tall sail on its back

and reptiles

It was a member of a group known as therapsids

Dunkleosteus terrelli Protoceratops It probably walked in aDunkleosteus terrelli was a species of arthrodirous placoderm fish that existed in the late Devonian period, from about 380 to 360 million years ago, in the Frasnian and Famenian. Contrary to previous estimates, recent research has shown that Dunkleosteus terrelli did not reach the enormous dimensions previously attributed. Instead of 10 meters in length, this armored fish is now believed to have been of a more moderate size, reaching approximately 3.