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Researchers at the University of California, Davis, led by Giacomo Bernardi, observed and documented an orange-dotted tuskfish (*Choerodon schoenleinii*) using a rock as an anvil to crack open shellfish. The fish was repeatedly filmed picking up clams and scallops, carrying them to a specific rock, and then thrashing its head to smash the shells against the hard surface, demonstrating deliberate and repeated tool use. This behavior, rare outside of primates and some birds, illustrates a sophisticated cognitive ability and problem-solving strategy in a teleost fish. This observation adds a fascinating dimension to our understanding of intelligence across the animal kingdom, pushing the boundaries of what was thought possible for fish. The discovery was reported in *Coral Reefs* in 2011.
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Why It’s Fascinating
The discovery of tool use in a fish, especially one that carries and repeatedly smashes prey against an "anvil," was profoundly surprising to animal behaviorists, overturning the long-held belief that such complex cognitive skills were almost exclusively limited to mammals and corvids. This confirms that advanced problem-solving and instrumental behavior can evolve convergently in widely divergent lineages, suggesting that environmental pressures can select for similar cognitive solutions. In the next 5-10 years, studying the neural mechanisms behind this fish's behavior could offer new insights into the evolution of intelligence and manipulative abilities in vertebrates. It's like finding a squirrel independently inventing a nutcracker using a specific tree stump. Ethologists, neuroscientists, and evolutionary psychologists benefit from this expanded view of intelligence. How many other species are using tools in ways we haven't yet observed or recognized?
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