Fish, using tools to … fish

At www.physorg.com/print241950691.html … rather, a fish using a tool to smash open a shell – various species of wrasse do this and there is photographic evidence of a tusk fish doing the same thing. This is distinctly disturbing as we have always been informed that just we humans are that clever. It was bad enough when primates were found to use tools to poke things out of tight places or crack nuts open but then it was found that crafty crows and various other birds, such as the thrush cracking open snails, also used tools in their everyday sort of chore … but fish, that's between a rock and a watery place. Isn't it?