Humans have 6 million olfactory receptors, while dogs have 300 million. Cats are, of course, mysterious.
Sniffing and analysing scents is a complex process that involves special receptors and lots of brain power. While we humans think we’re pretty nifty when we can smell perfume in a room, cats and dogs have super sniffer powers.
Plus, while all three species have a vomeronasal organ, a special patch of scent sensitive cells in the nose that lies just above the roof of the mouth, the one in humans appears to be non-functional or barely functional, while those in dogs and cats are fully optimised. Until recently, it was thought that dogs had the edge on outsniffing cats. However, a study that examined different kinds of scent receptor proteins in mammal noses found that cats have an ace.
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