. "You may notice your cat pulling funny face, with lip curled back and mouth partly open in a mesmerized grimace. This is known as the Flehmen response and occurs when the cat is 'tasting' the air. The cat is trying to gather as much information as possible from a scent, especially if another cat has entered his territory and left odour signals on plants or furniture."@en . . . "You may notice your cat pulling funny face, with lip curled back and mouth partly open in a mesmerized grimace. This is known as the Flehmen response and occurs when the cat is 'tasting' the air. The cat is trying to gather as much information as possible from a scent, especially if another cat has entered his territory and left odour signals on plants or furniture."@en . "Flehmen Response"@en .