Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The flehmen response (English pronunciation: /'fle m n/, German: ['fl :m n]), also called the flehmen position, flehmen reaction, flehming, or flehmening (from German flehmen, meaning to curl the upper lip), is a particular type of curling of the upper lip in ungulates, felids, and many other mammals, which facilitates the transfer of pheromones and other scents into the vomeronasal organ, also called the Jacobson's organ.

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