A fish using a rock/coral as an anvil to crack open prey?
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Why are we interested in this behaviour? Check out the research project. In short, we would like to determine all fish species that use anvils so we can (1) find out whether this behaviour evolved once or several times in the evolutionary history of fishes, and (2) to test hypotheses about the evolution of tool use, such as that tool use only evolves in species with large brains.