The world is full of wonderful animals, both extant and extinct, and they all have names. As a result, it’s fairly common for newly named animals to be given names already in use — as for example with the giant Miocene sperm whale “ Leviathan ” (now Livyatan ). BUt there are ways to avoid walking into this problem, and in a helpful post on the Dinosaur Mailing Group, Ben Creisler recently posted a summary.