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ãªã¬ãŽã³å·ç«å€§åŠã®Monique Udellæ°ããåŠè¡èªãFrontiers in Ethologyãã«çºè¡šããç ç©¶ã§ãçåŸ3ã8ã«æã®åç«ã察象ã«6é±éã®ããã¬ãŒãã³ã°ïŒç€ŸäŒåã¯ã©ã¹ããè¡ããåå ããåç«ïŒ31é ïŒãšåå ããªãã£ãå¯Ÿç §çŸ€ïŒ32é ãèš63é ïŒãæ¯èŒããããã®çµæãã¯ã©ã¹ã«éã£ãåç«ã¯æéãçµã£ãŠã課é¡ã®åŒå¥åŠç¿ïŒåºå¥ããŠåŠã¶åïŒãç¶æã§ããã®ã«å¯Ÿããã¯ã©ã¹ã«åå ããªãã£ãåç«ã¯åŒå¥åŠç¿ã®æçžŸãæéãšãšãã«äœäžãããããã¯ãããã®ç«ã§åããŠãèªç¥ãã€ã¢ã¹ãã¹ããïŒãããŸããªåºæ¿ã«å¯ŸããŠæ¥œèгçïŒæ²èгçã©ã¡ãã®åå¿ã瀺ãããæž¬ãææ³ïŒãçšããç ç©¶ã§ãããã
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