2005 年《哺乳動物學刊》(Journal of Mammalogy)上刊出一篇有意思的研究。大雙紋蝠(greater sac-winged bat, Saccopteryx bilineata)雄蝠翅膀上的翼囊(wing sac)會散發氣味來吸引異性。可是翼囊裡原來没有腺體,雄蝠在每天理毛時會清理翼囊,也把其它腺體的分泌物塗上去。作者發現每隻蝙蝠翼囊裡帶有不同的細菌,推測細菌代謝分泌物產生不同產物,成為這隻蝙蝠獨有的氣味,而這個氣味也就決定了它能不能成功吸引異性注意。不過這篇研究還是只有推論,還没有直接證據證實細菌的味道會不會影響動物的行為或判斷。
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