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・ Armoured trains of Poland
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Armpit effect
・ Armpit fetishism
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・ Arms Academy
・ Arms Act
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Armpit effect : ウィキペディア英語版
Armpit effect

The armpit effect in biology is when an individual learns what it smells like, then uses that to compare to the odor of other individuals.
==Background==
The armpit effect is a form of ontogenic recognition, wherein an animal uses its own or another animal’s physical characteristics for recognition purposes. Under this behavior model, an animal uses its own scent to distinguish between kin and non-kin. The odors that an animal uses to compare itself to its counterparts are caused by differences in genetics. Although the scent glands that produce an animal's odor are structurally similar, these genetic differences cause different odors to be released. An animal's ability to identify subtle genetic distinctions based on unique scents is facilitated by the olfactory system in the brain. The armpit effect is crucial for an animal to increase its fitness (biology) and reproductive success.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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