A new species of predatory dinosaur has been described from fossils found in South America, and to say they are intimidating is an understatement. With a thumb claw that makes the human hand look puny, it’s safe to say that Joaquinraptor casali would’ve been much feared in its ecosystem, back when it was munching crocodiles around 70 million years ago. That tells us that this creature must have lived during the Cretaceous period between 70 and 66 million years ago. Megaraptorans have been found across Asia, Australia, and South America, but our understanding of their behavior and anatomy has been limited by incomplete fossils. Still, being top dog wasn’t enough to save it, as we all know who came and crashed the party 66 million years ago.