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Sensory System

Smell

Do humans or bloodhounds have a keener sense of smell?

Humans smell the world using about 12 million olfactory receptor cells, whereas bloodhounds have 4 billion such cells and, therefore, a much better sense of smell. For example, the trace of sweat that seeps through shoes and is left in footprints is a million times more powerful than the bloodhound needs to track down someone.



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