The same reason you can’t differentiate dogs by smell of follow an hours old trail through the woods like your dog can. You are a human, uniquely specialized with a giant brain. The giant brain and the large fraction of the brain used for vision and language is way more brain than any other animal uses. We’re the freaks here. The dog has a big chunk of their brain allocated for smell, that’s how we can train them to smell things smugglers are working hard to hide.
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