SAN FRANCISCO - DECEMBER 21: Workers blow snow onto a Polar Bear named Pike as he plays in freshly blown snow in his enclosure at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
In this photo provided by the San Francisco Zoo, a snowblower shoots snow into the polar bear exhibit, 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.
SAN FRANCISCO - DECEMBER 21: Polar Bears named Pike (L) and Andy (R) play in snow that is being blown into their enclosure at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
In this photo provided by the San Francisco Zoo, Pike, a polar bear walks out of her pond, while a snow blower shoots snow into the polar bear exhibit, 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.
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.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike plays in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike prepares to open a gift box while playing in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Pike buries his head in a gift box while playing in freshly blown snow at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.
SAN FRANCISCO - DECEMBER 21: A Polar Bear named Ulu inspects a holiday gift at the San Francisco Zoo December 21, 2009 in San Francisco, California. The San Francisco Zoo celebrated the first day of winter by transforming 10 tons of donated ice into snow for two of the zoo's Polar Bears, Andy and Pike.