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Dogs have an extraordinary sensitivity to
smells. When roaming in the street they find
the smells left by other dogs, and those which
are peculiar to people, and they learn things
about them. They can detect the slightest
scent in the air without any difficulty at all.
Bloodhounds, a breed of dog which has a par-
ticularly strong sense of smell, can track peo-
ple from places where they have left no visi-
ble trace, follow a trail that is four days old
and find the scent of people more than
80 kilometers away.
