Cleaner fish, often underestimated marine creatures, are about to reveal a side of themselves that could change our perception of animal intelligence. A recent study conducted by researchers at Osaka Metropolitan University in Japan, published in Scientific Reports, has unveiled surprising cognitive abilities in these small ocean dwellers, comparable to those of marine mammals like dolphins.
The research focuses on Labroides dimidiatus, known for their activity of cleaning larger fish. Scientists conducted ingenious experiments to test the self-awareness of these fish, using the mirror test, a well-established method for evaluating an animal's ability to recognize itself in a mirror.
In a twist, the researchers reversed the traditional approach. They applied parasite-like marks on the cleaner fish, then observed how they reacted to the mirror. The results were surprising. The fish quickly learned to use the mirror to remove the fake parasites, demonstrating a self-awareness that exceeded expectations.
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The study's first author, Shumpei Sogawa, emphasized how the order of the experiment played a crucial role. The fish, aware of something unusual on their bodies, used the mirror to obtain immediate visual information, acting with surprising speed.
But the real surprise came with an even more sophisticated behavior. Some fish picked up small pieces of shrimp, carried them toward the mirror, and dropped them. They then carefully watched the shrimp's descent in the reflection, repeatedly touching the glass. This behavior, defined as a "contingency test," suggests an advanced understanding of the relationship between self and the surrounding environment.
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Masanori Kohda, co-author of the study, highlighted the importance of these results, which could suggest a broader spread of self-awareness in the animal kingdom. The implications of this research could have a significant impact on various areas, from animal welfare to medical research, and even artificial intelligence studies.
This discovery opens new perspectives on animal cognition, inviting us to reconsider the capabilities of creatures we often take for granted. Cleaner fish, with their unexpected intelligence, remind us that the natural world is full of surprises and that there is still much to learn.
