The mirror test was developed by psychologist Gordon Gallup Jr.1 in 1970 as a method for determining whether a non-human animal has the ability of self-recognition. It’s also known as the “mark test” or “mirror self-recognition test” (MSR). When conducting the mirror test, scientists place a visual marking on an animal’s body, usually with scentless paints, … Continue reading List of Animals That Have Passed the Mirror Test