Rigargosaurus

Rigargosaurus, name meaning Rigar's lizard, is an extinct species of sauropod that lived in what is now North America during the Late Jurassic. It was one of the first ever confirmed species of sauropod that had a trunk, unlike other sauropods, which didn't had trunks due to nasal holes that were too small to support the trunk, but Rigargosaurus had a hole that did support the short elephant-like trunk. Like all sauropods, however, it was a peaceful herbivore that fed on nothing but leaves, ferns, cycads, and some other leafy plants. It was about three times the size of an Asian elephant. It is unknown why Rigargosaurus became extinct in the Late Jurassic.