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This photo provided by the Philadelphia Zoo shows Coldilocks, the oldest polar bear in the U.S., at 37. The zoo says they celebrated her birthday Thursday, Dec. 14, 2017, with a cake made of peanut butter, honey, raisins and fish. (Philadelphia Zoo via AP)

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The Philadelphia Zoo has thrown a birthday party for 37-year-old Coldilocks, the oldest polar bear in captivity in the United States.

By Associated Press December 17, 2017