Mice have recently joined a select group of animals that have passed the mirror self-recognition test (MSR) — a commonly recognized indicator of self-awareness.
This exclusive club also includes great apes, bottlenose dolphins, and European magpies, to name a few.
Recently, a team of researchers performed a set of experiments in which they marked the foreheads of black-furredwith white and black ink marks.
Upon observing their reflections in the mirror, the mice attempted to remove the ink stain from their foreheads.
Aby the researchers highlighted that “the mice only showed this self-recognition-like behavior if they were already accustomed to mirrors if they had socialized with other mice who looked like them, and if the ink spot was relatively large.”