Oyster Toadfish (Opsanus tau)
An oversized head and a large, frowning mouth give the oyster toadfish the look of a tough customer—and in this case appearances are not deceiving. This bottom-dwelling camouflage artist can crush mollusk shells with its jaws and strong teeth, and devour oysters, crabs, shrimp, squid, fish, and a host of other marine creatures. But oyster toadfish males have a soft side. They guard the nest and even keep watch over young hatchlings during their first few weeks of life.
Photo and info from National Geographic