NEW: Baryonyx

Never smile at a crocodile, and don’t even smirk at this guy, whose mouthful of conical, sharply serrated teeth is the perfect man-masticating machine. The Baryonyx, which gets its name from the “heavy claw” you’ll notice on its first finger, comes in at 33 feet in length, 1.9 tons, and dates back to the early Cretacious.