PHILADELPHIA (AP) - The oldest captive polar bear in the U.S. has died.

The Philadelphia Zoo on Tuesday said that the 37-year-old Coldilocks has been euthanized following a serious decline in her health.

The zoo said Coldilocks had a variety of age related medical issues and showed worsening changes in her behavior and appetite before her death. They also said the bear far surpassed the roughly 23-year lifespan of a typical polar bear.

Dr. Andy Baker, the zoo's chief operating officer, says Coldilocks brought attention to how climate change affects polar bears. He says she will be greatly missed.

Coldilocks was born Dec. 13, 1980 at Seneca Park Zoo in New York and arrived at the Philadelphia Zoo about a year later.

In Anchorage, the Alaska Zoo recently lost Ahpun the polar bear to a sudden illness. Another polar bear at the zoo, Louie, has also been reportedly ill, but zoo director Pat Lampi said Tuesday that the bear was continuing to improve and "moving around much better."

Lauren Maxwell contributed information to this story.

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