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The human sense of smell is very poor compared to that of animals such as dogs. Some dogs are able to identify and follow the smell of a person's perspiration, even though it may be several days old.

These so-called sniffer dogs are often used to find people buried beneath an avalanche or in houses destroyed in earthquakes. They can identify just a few molecules of human perspiration.

Vultures can smell a decaying body from several kilometres away. Even the human nose can detect tiny amou read more...

Tags: smell, animals, human

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