POLAR BEARS - can smell a seal on the ice 20 miles away. No wonder they're nicknamed "noses with legs."
ARCTIC HARES - can smell dwarf willow leaves beneath several feet of snow.
SQUIRRELS - can smell the tiny acorns they buried the previous autumn
DOGS - can smell one drop of urine in a swimming pool full of water.
Wolves - can smell prey more than a mile away if the wind is right. They can also smell the presence of an animal three days after it's left.
PIGS - can be trained to find truffles - prized edible fungi that grow underground. (Some police departments use pigs to sniff out drugs.)
COONHOUNDS - can smell when a raccoon's track was made, how fast it was traveling, and in what direction.
BLOODHOUNDS - can follow a scent that is four days old.
DOGS - can point out a sick catfish to fish farmers and even smell if there are termites in the house.
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