It's how polar bears sense a dead whale 20 miles away
... On 
smooth, slippery slopes, a polar bear may slide on its belly, legs out... [DOC] [TLE] Bears Polar Bears Wildlife Arcticcubsice Tundrasealspolar Region ... [PAR] Bears Polar Bears Wildlife Arcticcubsice Tundrasealspolar Region Predator ... 
Polar bears have an excellent sense of smell and they can sniff out a pup in its 
den ... smell since they can smell carrion, such as dead whale, from 20 miles 
away.