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The flehmen response is a behavior observed in many mammals, including cats, horses, and elephants, where they curl back their upper lip and open their mouth after smelling something interesting. This action helps to draw scent molecules into the Jacobson's organ, also known as the vomeronasal organ, located on the roof of the mouth. This specialized organ contains chemoreceptors that detect pheromones and other chemical signals, providing detailed information about the animal's surroundings, such as mating opportunities and territorial boundaries. The flehmen response allows animals to gather more nuanced information than through their regular sense of smell alone, aiding in social communication and environmental awareness.123

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