Oryxodontosaurus

Oryxodontosaurus, name meaning Oryx toothed lizard, is an extinct species of bipedal ornithopod that lived in what is now North America during the Late Jurassic period. It was the second large herbivorous dinosaur to have a entire life appearance that could be determined, having coloration similar to that of today's gazelles. It was once thought to be an Iguanodont part of the Dryosauridae family due to its size almost as big as Dryosaurus, but later analysis concluded that it was the earliest known Parksosauridae to have evolved. It was a complete herbivore that fed on ferns, horsetails, cycads, and other leafy plants. It is unknown why this dinosaur species became extinct.