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A silverback gorilla briefly looks his reflection in the eyes and yawns: not tiredness, but arousal!

𝗔 𝗺𝘂𝘀𝘁 𝗿𝗲𝗮𝗱 𝗶𝘀 𝘁𝗵𝗲 𝘀𝗰𝗶𝗲𝗻𝘁𝗶𝗳𝗶𝗰 𝗲𝘅𝗽𝗹𝗮𝗻𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝘁𝗵𝗶𝘀 𝘀𝗶𝗹𝘃𝗲𝗿𝗯𝗮𝗰𝗸 𝗯𝗲𝗵𝗮𝘃𝗶𝗼𝘂𝗿 𝗯𝘆 𝗝𝗶𝗺 𝗔𝗻𝗱𝗲𝗿𝘀𝗼𝗻, 𝗣𝗿𝗼𝗳𝗲𝘀𝘀𝗼𝗿 𝗘𝗺𝗲𝗿𝗶𝘁𝘂𝘀 𝗼𝗳 𝗞𝘆𝗼𝘁𝗼 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆. (𝗘𝗻𝗴𝗹𝗶𝘀𝗵/𝗙𝗿𝗲𝗻𝗰𝗵)

Silverback male gorillas (SBs) lead their group’s movements, and they are preoccupied with protecting the females and their offspring from external dangers. One source of threat is other SBs, who might try to take over the resident SB’s group by force. For this reason, when SBs encounter each other, their relations are usually agonistic, with intimidation displays that can escalate to physical aggression.
For many animals, seeing their own reflection in a mirror can also elicit aggression. In a small corner of the Gabonese rainforest, several large mirrors have been installed for more than 8 years. At first, whenever he saw his reflection, this SB engaged in typical agonistic postures and chest beating displays, while avoiding direct eye contact with his “rival.” Now, after many encounters with his own reflection and those of the other members of his group, he still clearly remains tense and defiant, sometimes charging and chest-beating, repeatedly showing tension yawns, and mostly avoiding to look the rival in the eye. On this occasion, however, the SB also engages in several bouts of direct eye-contact, suggesting that he might be starting to understand that the SB in the mirror poses little real threat. The reflection never fully appears, it never vocalizes, and only imitates what the SB does. Maybe this wild adult male gorilla is learning that the reflection is not another gorilla, but himself. As in human infants and great apes in captivity, self-recognition is not innate; it must be learned. Other videos on this channel show examples of wild African great apes learning about optical properties of mirrors, including a young blackback male gorilla in the SB’s group, and several chimpanzees.

Les gorilles mâles à dos argenté (GDA) dirigent les activités de leur groupe et se préoccupent de protéger les femelles et leur progéniture des dangers extérieurs. L'une de ces sources de menace est constituée par d'autres GDA, qui pourraient essayer de prendre par force le contrôle du groupe de ce GDA occupant les lieux. C'est pourquoi, lorsque les GDA se rencontrent, leurs relations sont généralement conflictuelles, avec des manifestations d'intimidation qui peuvent dégénérer en agression physique.
Chez de nombreux animaux, le fait de voir leur propre reflet dans un miroir peut également susciter l'agression. Au Gabon, dans une zone reculée de la forêt équatoriale, plusieurs grands miroirs sont plantés depuis plus de 8 ans. Au début, lorsqu'il voyait son reflet, ce GDA adoptait des postures agonistiques typiques et battait sa poitrine, tout en évitant le contact visuel direct avec son "rival". Maintenant, après de nombreuses rencontres avec son propre reflet et ceux des autres membres de son groupe, il reste clairement tendu et défiant, chargeant parfois et battant sa poitrine, tout en montrant à plusieurs reprises des bâillements de tension, et évitant la plupart du temps de regarder le rival dans les yeux. Cette fois-ci, cependant, ce GDA se livre également à plusieurs reprises à un contact visuel direct, ce qui suggère qu'il commence peut-être à comprendre que le GDA dans le miroir ne représente pas une réelle menace. Le reflet n'apparaît jamais complètement, il ne vocalise jamais, et se contente d'imiter les gestes de GDA. Peut-être que ce gorille mâle adulte sauvage apprend que le reflet n'est pas un autre gorille, mais lui-même. Comme chez les bébés humains et les grands singes en captivité, la reconnaissance de soi n'est pas innée ; elle doit être apprise. D'autres vidéos sur cette chaîne YouTube montrent des exemples de grands singes africains sauvages apprenant les propriétés optiques des miroirs, notamment un jeune gorille mâle black-back (dos noir donc pas encore dos argenté) dans le groupe du GDA, et plusieurs chimpanzés.
(Jim Anderson, Professeur émérite à l'Université de Kyoto)
𝙉𝙤𝙩𝙚 𝙛𝙧𝙤𝙢 𝙓𝙖𝙫𝙞𝙚𝙧 𝙃𝙐𝘽𝙀𝙍𝙏-𝘽𝙍𝙄𝙀𝙍𝙍𝙀: 𝙋𝙧𝙤𝙛. 𝘼𝙣𝙙𝙚𝙧𝙨𝙤𝙣 𝙝𝙖𝙨 𝙨𝙩𝙪𝙙𝙞𝙚𝙙 𝙩𝙝𝙚 𝙗𝙚𝙝𝙖𝙫𝙞𝙤𝙪𝙧 𝙤𝙛 𝙣𝙤𝙣𝙝𝙪𝙢𝙖𝙣 𝙥𝙧𝙞𝙢𝙖𝙩𝙚𝙨 𝙛𝙤𝙧 𝙢𝙤𝙧𝙚 𝙩𝙝𝙖𝙣 40 𝙮𝙚𝙖𝙧𝙨, 𝙞𝙣𝙘𝙡𝙪𝙙𝙞𝙣𝙜 𝙗𝙖𝙗𝙤𝙤𝙣𝙨 𝙖𝙣𝙙 𝙘𝙝𝙞𝙢𝙥𝙖𝙣𝙯𝙚𝙚𝙨 𝙞𝙣 𝙬𝙚𝙨𝙩 𝘼𝙛𝙧𝙞𝙘𝙖, 𝙖𝙣𝙙 𝙢𝙖𝙘𝙖𝙦𝙪𝙚𝙨 𝙞𝙣 𝙄𝙣𝙙𝙞𝙖. 𝙃𝙚 𝙝𝙖𝙨 𝙥𝙪𝙗𝙡𝙞𝙨𝙝𝙚𝙙 𝙤𝙫𝙚𝙧 200 𝙨𝙘𝙞𝙚𝙣𝙩𝙞𝙛𝙞𝙘 𝙥𝙖𝙥𝙚𝙧𝙨 𝙤𝙣 𝙥𝙧𝙞𝙢𝙖𝙩𝙚𝙨.

Видео A silverback gorilla briefly looks his reflection in the eyes and yawns: not tiredness, but arousal! канала Xavier HUBERT-BRIERRE
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22 мая 2021 г. 17:15:01
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