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Although claims are made that some species of bear, or even dogs, have the best sense of smell, scientists have recently determined that African Elephants have the largest number of genes dedicated to smell of any mammal. African Elephants have around 2,000 genes alone that are dedicated to scent, twice the number of smell genes as dogs and five times more than humans. This large repertoire of smell genes might be attributed to elephants' heavy reliance on scent in various contexts, including foraging, social communication, and reproduction. Research has also shown that elephants have well-developed olfactory systems that include large olfactory bulbs and large olfactory areas in the brain.

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