Answer: This reaction, which is known as flehmen, occur when a cat is strongly attracted to scent. It is most commonly seen when a tom cat smells a female in a hear or her urine, but it is also shown by neutered males and females, for example when smelling the anal region of strange cats.
The animals extends his nick and lifts his lower lip producing a grimace suggesting that the finds smells disgusting. But in face by doing this he is constricting the nasal chambers ensuring that when he inhales, the scent particle are drown through a duct leading off the roof of the mouth into special pouch, the vomeronasal organ or Jacobson’s organs. They are detected by special sensory cells which cannot with the brain. This organ is possessed by all animals, except the man and certain other primates, and result in a greatly enhanced sense of smell, particularly for perceiving those odors which act as sexual attachment.
