I think the polar bear has already been explained. Remember when Sawyer and Kate were locked in the cages - those were where the Dharma folks kept the bears. Ever since we saw Ben turn the frozen donkey wheel, I guess I assumed the bears were trained to be the ones to push the wheel (remember when Charlotte found the body of a polar bear with a Dharma collar on somehwere in the Tunisian desert?).
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Never let the facts stand in the way of a good answer. -Tom Magliozzi
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