Leosaurus

Leosaurus was a species of carnosaur theropod dinosaur that was part of the Allosaurid family. It lived in what is now North America during the Late Jurassic period. It was the first ever species of large carnivorous dinosaur to be discovered with its real color and the first ever large plant eating dinosaur species for which almost the entire life appearance could be determined. It was mostly tannish in color and males had a lion-like feathery mane darker in color than their body color, possibly for the same use as today's lions, for defense while fighting other dinosaur predators, as well as other males of the same species in a territory. It was also twice the size of a Ceratosaurus, despite this, it was still not as large as Allosaurus. It is unknown why Leosaurus became extinct at the end of the Jurassic.