Herrerasaurus means 'Herrera's Lizard' for the discoverer Don Victorino Herrera. Herrerasauruses grow to about 16.5 feet long and live everywhere. It isn't the biggest predator although other giants are not dinosaurus. They are in fact Crocodilians. Unlike the other giant killers, Herreasaurus stands on it's hind legs. It is a very fierce predator.