While not the most beatiful fish to look at, the stonefish has needle-like dorsal fins, lined with venomous glands. The stonefish is able to blend into the ocean floors, allowing to be easily hidden from the desired prey.
The Brown Booby has developed a beak that allows for it to nose dive into the water to fish for it's food. The Brown Booby also digs holes in order to hide the eggs from other predators.
The Green Turtle has developed wonderful migrating patterns and shift according to seasons. They also have serrated teeth to eat their plants and possible crustaceans.