Story perspectives

Cleaner Wrasse Shows Self-Recognition, Challenging Animal Cognition Views

2/21/2026

Summary

Story summary

Osaka Metropolitan University researchers report self-recognition in cleaner wrasse, evidenced by rapid self-scraping after marking in front of a mirror, averaging 82 minutes.
In this study, fish were marked before exposure, and some showed contingency testing by moving food near the mirror.
The findings challenge self-awareness views and suggest such abilities may exist across species, including fish.
As a result, the work could reshape understanding of animal cognition and evolutionary biology.

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Story summary

Osaka Metropolitan University researchers report self-recognition in cleaner wrasse, evidenced by rapid self-scraping after marking in front of a mirror, averaging 82 minutes.
In this study, fish were marked before exposure, and some showed contingency testing by moving food near the mirror.
The findings challenge self-awareness views and suggest such abilities may exist across species, including fish.
As a result, the work could reshape understanding of animal cognition and evolutionary biology.