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We should be skeptical of any claim that pits one animal’s sense of smell against another’s. I have repeatedly read that an elephant’s sense of smell is five times more sensitive than a bloodhound’s, but that’s an utterly meaningless statement. Does that mean the elephant detects five times more chemicals? Does it sense certain chemicals at a fifth the concentration, or from five times the distance? Does it remember smells for five times as long? Such comparisons will always be flawed because smell is diverse and often unquantifiable.
