Front of mirror chimpanzee slap dance to scare intruders infiltrated their domain (their own images)

Description English/French. 𝐑.𝐈.𝐏. 𝐇𝐞𝐚𝐝𝐩𝐡𝐨𝐧𝐞 𝐔𝐬𝐞𝐫𝐬 Front of a mirror, each chimpanzee effectively recognizes his neighbour among the reflections, he also notices the presence of a stranger he has never met : his own image he does not know. Why is he here? In an attempt to scare away this stranger, this chimpanzee shows his large build, in standing in a bipedal position, stretching out his arms, ruffling his hair and shows his strength with heavy slaps with his hands on the ground . His reflection adopting the same behaviours, despite the cries of support from other members of the group sitting near the mirror, he hesitates to fight this unknown congener. To feel stronger, nothing is better than a tree branch in hand, but the opponent (the reflection) instantly responds to these attitudes with identical behaviors!. The properties of the mirror are very difficult to u