Summary:

- The study found that some fish species, such as the cleaner wrasse, are capable of self-recognition in a mirror, a cognitive ability previously thought to be limited to a few highly intelligent animals.
- Researchers conducted a mirror test experiment, where fish were exposed to a mirror and their behavior was observed. The fish exhibited behaviors indicative of self-awareness, such as checking their bodies in the mirror and using the mirror to inspect parts of their body they cannot normally see.
- This discovery challenges the notion that self-awareness is a uniquely human trait and suggests that some fish species possess a level of cognitive complexity and self-awareness that was previously underestimated.