 Gallup (1970) devised a test for mirror self-recognition: surreptitiously placing a red mark on a subject’s forehead before exposure to a mirror, then observing whether they touch the relevant spot. It is well established that chimpanzees pass the mirror test while other primate species fail (Anderson &amp; Gallup 2011). It has also been claimed that dolphins and some elephants pass the test (Reiss &amp; Marino 2001; Plotnik et. al. 2006). With respect to human infants, the consensus is that success in the mirror test begins at around 15 to 18 months of age, and that by 24 months most children pass (Amsterdam 1972; M. Lewis &amp; Brooks-Gunn 1979; Nielsen, Suddendorf, &amp; Slaughter 2006).