Mongolian dinosaur wielded 'big, sharp and nasty' claws

Fossils discovered in Mongolia have revealed an unusual new species of dinosaur. Duonychus tsogtbaatari falls into a group of giant-sloth-like dinosaurs called therizinosaurs, but with one unique feature: every therizinosaur discovered so far had three, clawed fingers; Duonychus, as its name suggests, only had two. The fossil’s remarkably-preserved claws were around 30 cm long, and researchers say the dinosaur wasn’t fully grown.