Vine or branch in hand, gorillas and chimps are emboldened to attack their reflection in a mirror.

𝗔 𝗺𝘂𝘀𝘁 𝗿𝗲𝗮𝗱 𝗶𝘀 𝘁𝗵𝗲 𝘀𝗰𝗶𝗲𝗻𝘁𝗶𝗳𝗶𝗰 𝗲𝘅𝗽𝗹𝗮𝗻𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝘁𝗵𝗲𝘀𝗲 𝗴𝗿𝗲𝗮𝘁 𝗮𝗽𝗲𝘀’ 𝗯𝗲𝗵𝗮𝘃𝗶𝗼𝘂𝗿 𝗯𝘆 𝗝𝗶𝗺 𝗔𝗻𝗱𝗲𝗿𝘀𝗼𝗻, 𝗣𝗿𝗼𝗳𝗲𝘀𝘀𝗼𝗿 𝗘𝗺𝗲𝗿𝗶𝘁𝘂𝘀 𝗼𝗳 𝗞𝘆𝗼𝘁𝗼 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆. Most humans recognize themselves in a mirror, but this ability requires learning about mirrors. Young babies do not know that they are looking at their own reflection; at first, they react to their image as if it were another baby. They smile and vocalize toward the little playmate, try to touch it, and look or crawl behind the mirror to find it. Into her second year, the infant explores the visual properties of the mirror more intensely: pulling faces, clowning around, and testing the continencies of the mirror all contribute towards the realization that she is looking at an image of herself. By the age of 24 months, most infants show correct use of the mirror to investigate their appearance, checking their hair, looking at their tongue or inside their mouth, or noticing a mark on their face that can only be seen in the reflection. Psychologists study the development of self-recog