Not only do cats have a far better sense of smell than human beings but they also have a special organ designed to detect pheromones. This organ is the vomeronasal organ and it is located at the base of the nasal cavity. Its nerves carry messages on a separate route to the brain than that of the normal sense of smell. Cats regularly use this organ. Wikipedia describes the answer to why do cats open their mouths after they smell something this way:
Some mammals [including cats] use a distinctive facial movement called the flehmen response to direct inhaled compounds to this organ. The animal will lift its head after finding the odorant, wrinkle its nose while lifting its lips, and cease to breathe momentarily.
When snakes put their tongues out to touch something and then touch the top of their mouths with the tongue, they are using the same organ. Elephants do the same with their trunks. Human beings have a rudimentary version of this in the womb: but by birth it will almost completely disappear and it’s most likely that the remaining remnants do not work. In contrast, for the cat the airborne chemical messages it detects by this organ are most important. Why do cats open their mouths after they smell something? When it opens its mouth it is savoring these signals which are highly enjoyable. For a few seconds it may go into a trance like state as it works out what it all means. Opening the mouth heightens the experience.
Why Do Cats Open Their Mouths After They Smell Something? See it in action:
The most important meaning is about sex and reproduction. The female cats urine contains pheromones that trigger a strong open mouth reaction from a male cat. When the female is out of season the response is much weaker. Many other airborne smells can be detected this way and most cats regularly use this remarkable sense. Please share this with your friends using the button below.