A new addition to a list that includes humans, chimps, gorillas, orangutans, capuchins, New Caledonian crows, sea otters, and the coconut octopus.
While exploring Australia's Great Barrier Reef, professional diver Scott Gardner heard an odd cracking sound and swam over to investigate. What he found was a footlong Blackspot Tuskfish (Choerodon schoenleinii) holding a clam in its mouth and whacking it against a rock. Soon the shell gave way, and the fish gobbled up the bivalve, spat out the shell fragments, and swam off. Fortunately, Gardner had a camera handy and snapped what seem to be the first photographs of a wild fish using a tool. Oh, and Australian wildlife does it again, woot.