Deep in the jungle of Late Cretaceous New Mexico, circa 91 million years ago, a Nothronychus mckinleyi munches on some low-hanging lianas. Nothronychus was a member of the Therizinosauridae, a family of feathered theropods that evolved a herbivorous diet and were characterized by long scythe-like claws on their fingers which they probably used to hack through vegetation. When fully grown, Nothronychus would have been around fourteen feet long and stood a bit higher than a human being from foot to head.