Megalonyxosaurus

Megalonyxosaurus is an extinct species of Titanosaurid sauropod that lived in what is now Argentina and Brazil during the Late Cretaceous from 75 million years ago to 66 million years ago. It was the oddest of any known sauropod ever discovered, being about the size of a rhino, having a hunched back, a beak which no other sauropod has, and short tail with tall upright scales, but the most bizarre is the claws it had on its front legs instead of hoof-like toes of most other sauropods, so they could have used these claws for protection against predators and fight against other males and/or for pulling down branches to feed on leaves. It is unknown on why this sauropod became extinct suddenly.