Dunkleosteus was a large bony fish that lived in the Devonian. It acted similar to a great white shark accept its teeth is nothing but extended armor from its body. It can crush a fish with the same force of a tank. Its body is so heavily armored it rely on stealth ambush to hunt its prey. It can even eat the sharks and other fish that lived in the Devonian oceans. It is also a cannibal who does not hesitate to devour its own kind.