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

It preceded the Dinosaurs by about 50 MY and belonged to a totally different reptilian lineage

It probably walked in a quadrupedal position

narrow head

but was generally crescent- or fan-shaped

Dunkleosteus terrelli Protoceratops was a flightless bird endemicDunkleosteus 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.