Police dogs can distinguish the scents of identical twins, even when they live together and eat the same food. Dogs are used to identify suspects and find dead bodies due to their sensitive noses, with bloodhounds having over 300 million olfactory receptors.
Police dogs can distinguish the smells of identical twins, even when the twins live in the same house and eat the same diet. In one experiment, researchers took sweat samples from identical twins, then placed them in a room with other people’s samples. The police dogs were then told to find the scent of a particular twin, and although the twins’ genetic material would have fooled a DNA test, the dogs picked the right sample every time.
More dog and perfume facts:
Scent lineups are routinely used to identify suspects in some European countries. The dogs are given a scent from a crime scene and match it to a suspect.
Dog noses are so sensitive that they can detect a body even when it’s under running water. Many police units also use specially trained “cadaver dogs” to find dead bodies.
Most dogs have around 200 million olfactory receptors in their noses, compared to around 5 million in human noses. Bloodhounds, known for their powerful tracking ability, have more than 300 million receptors and have been able to track a scent for more than 130 miles (about 209km).
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