Wrasses Smash ShellfishAgainst Rocks to Open Them
A species of wrasse, a family of brightly colored tropical fish, was the first fish confirmed to use tools. In a video captured in 2011 by a diver in the Great Barrier Reef, the orange-dotted tusk fish can be seen digging a cockle out of the sand and carrying it some distance in its mouth to a large rock. The fish then proceeded to slam the shellfish against the rock until it opened. Similar behaviors had been described in other wrasses, but the images represented the first photo evidence of the ability. The images were published in a scientific journal, and the researchers stressed that the discovery opened a world of possibilities. “We really need to spend more time filming underwater…It really is the final frontier down there,” they said in a press release.