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Study: Reef fish may know it's seeing its reflection in mirror

A coral reef fish may be able to recognize itself in a mirror, according to a study published in PLOS Biology. After researchers injected a colored dye on the throats of bluestreak cleaner wrasses and placed them in a mirrored tank, the fish appeared to try to scrape the mark off after seeing themselves in the mirror, potentially a sign of self-awareness.

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