Carnotaurus

Carnotaurus was an unusual meat-eating dinosaur that lived during the mid-Cretaceous period, 113 to 91 million years ago. It had knobby horns over its eyebrows, which were used for head butting and mating rituals, and four-fingered “hands” with a backward-pointing spike. While most dinosaur fossils have been found in North America, Carnotaurus was discovered in Argentina, South America and quite recently (1984) by José F. Bonaparte. He found only a single fossil, but it was so well preserved that rough bumps were visible on its skin.