What’s that funny face and smirk all about? It is something which most of us have seen before since it’s actually not all that uncommon to observe in most domestic house cats. You’ve possibly seen the expression, the one which is followed by an intense sniffing session. This upward lip curling and exposing of the front teeth and gums is a behaviour which is practiced by carnivores big and small, and even hoofed animals, and is generally a means of testing and analysing different scents. Scents can be checked for any number of reasons but are predominantly used to determine sexual condition or to investigate a newcomer within a territory. This is done through a specialised organ called the vomeronasal organ, more commonly known as the Jacobson’s organ. It is situated in the top palate and the grimace is in an attempt to ensure the scent reaches the organ in the roof of the mouth.