The manta ray has the highest brain-to-body-mass ratio of any other fish.?
That brain gets put to good use: A 2016 testing a manta ray¡¯s intellectual capabilities found the animals displayed human-like self-awareness by accurately identifying themselves in a mirror. Rays also hunt in groups, which suggests a sophisticated level of social intelligence, and they've displayed the to map their environment using sight and smell while also retaining an impressive long-term memory.
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