This story proves how we’ve only scratched the surface of what we know about the ocean and marine life.
Some animals are classified as “intelligent” if they use tools right? What about fish? It is known that some fish use tools to crush the shells of their prey but it is not well documented in photos. Recently a diver on the Great Barrier Reef managed to photograph a tuskfish using a rock as an anvil to smash a clam shell open.
Tool use in the tuskfish Choerodon schoenleinii?

Fig. 1 a–f: Series of six photographs of a black spot tuskfish, Choerodon schoenleinii using a rock as an anvil to open a cockle shell. The photographs span 75 s and were taken while on a dive in the Keppel Islands region of the southern Great Barrier Reef in Queensland, Australia. Broken shells are seen lying on the sand near the rock.