Mirror, mirror, in my tank, who's the biggest fish of all?

Researchers have demonstrated that bluestreak cleaner wrasse (Labroides dimidiatus) checked their body size in a mirror before choosing whether to attack fish that were slightly larger or smaller than themselves, saying it was the first time for a non-human animal to be demonstrated to possess some mental states that are elements of private self-awareness.

from All Top News -- ScienceDaily https://ift.tt/OuRSzmx