Polar Bears

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In this photo provided by the San Francisco Zoo, Pike, a polar ...

Mon Dec 21, 4:40 PM ET

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In this photo provided by the San Francisco Zoo, Pike, a polar bear spreads herself out in the snow, by a holiday themed gift filled with bear treats, Monday, Dec. 21, 2009 at the San Francisco Zoo in San Francisco. Approximately 10 tons of ice was turned in snow and shot into the polar bear exhibit to celebrate the first day of winter and to create a fun playground for two of the Zoo's polar bears. The two bears in the exhibit rolled, dug and reveled in the snow.

(AP Photo/George Nikitin)