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February, 1995:   Klondike tries to get the attention of zookeeper Cindy Bickel, who is busy exercising Klondike's sister, Snow, Friday at the Denver Zoo. The polar bears were born Nov. 6, and each has overcome rickets. The 33-pound Klondike can walk. Snow, at 28 pounds, still has trouble. The bears are the zoo's top attraction. By Ellen Jaskol / Rocky Mountain News...polar bear bite