1. Polar bears are powerful swimmers and have been recorded on swims of 100 miles but the ordeal can leave them exhausted and susceptible to drowning.
2. Polar bears feed primarily on ringed seals and use sea ice for feeding, mating and giving birth.
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3. Polar bears and grizzlies have been successfully paired in zoos before - Stirling could not speculate why - and their offspring are fertile.
4. In'Polar Palin'players control polar bears armed with dynamite who must try to blow up " campaign tanks " driven by the Alaska governor.
5. Their equipment includes neoprene suits, a boat and guns in case they were attacked by polar bears.
6. Environmentalists contend shrinking polar ice due to global warming may lead to the disappearance of polar bears before the end of the century.
7. She also expressed her appreciation for their sentry, who watched for polar bears on the ice caps.
8. Polar bears have clear hair shafts that appear white because they reflect light.
9. The Arctic wolves will neighbour two polar bears, which arrived last year.
10. In coming decades, threats could widen to creatures ranging from polar bears to tropical butterflies.