Cats have 2 organs of scent
1. the nose
2. the vomeronasal organ
Odours are so important to a cat's survival that they have a second organ of scent called the vomeronasal or Jacobsen's Organ enabling them to 'taste' significant smells.
This organ consists of two small apertures behind the front teeth in the roof of the mouth that connect to the nasal cavity. The cat opens its mouth and draws the air into the apertures; the facial expression adopted at this time looks like a kind of grimace and is referred to as the Flehmen response.
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