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flehmen response
The flehmen response (; ), also called the flehmen position, flehmen reaction, flehming, or flehmening, is a behaviour whereby an animal curls back its upper lips exposing its front teeth, inhales with the nostrils usually closed and then often holds this position for several seconds. It may be performed over a site or substance of particular interest to the animal (e.g. urine or faeces) or may be performed with the neck stretched and the head held high in the air. Flehmen is performed by a wide range of mammals including ungulates and felids. The behaviour facilitates the transfer of pheromones and other scents into the vomeronasal organ located above the roof of the mouth via a duct which exits just behind the front teeth of the animal.
==Etymology==
The word originates from the German verb ''flehmen'', to bare the upper teeth or comes from the Upper Saxon German ''flemmen'', to look spiteful.〔(【引用サイトリンク】title=flehmen )〕
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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