|Image from Wikimedia Commons|
If Dunkleosteus were alive today, they could easily compete in a contest for the ocean's most deadliest. Alas, all species of class Placodermi went extinct by the end of the Devonian period, leaving no living descendants and giving way for the rise of other carnivorous swimming creatures. Fossils and casts of Dunkleosteus can be found in museums around the world, so if you can find one, go see it! That picture above does its size absolutely no justice.