SAN DIEGO (AP) – A beloved polar bear has died unexpectedly at Seaworld in San Diego.

Szenja was a 21-year-old female. The park says she died Tuesday.

READ MORE: Missing Auburn Man Found Dead Near Gold Country Fairgrounds

Caregivers said she has had a loss of appetite and energy for about a week.

A necropsy is planned, but the park says it could be several weeks before the cause of her death is known.

Szenja was born at a zoo in Germany in 1995. Two years later, she was brought to SeaWorld when the park opened its Wild Arctic exhibit.

READ MORE: Turlock Man Accused Of Sending And Receiving Child Porn Online

Polar bears can live about 18 years in the wild and 20 to 30 years or more in captivity.

The oldest polar bear in the United States, a female called Uulu, died last Friday at the San Francisco Zoo. She was 36.


MORE NEWS: Fatal Crash Blocks Lanes Of Highway 50 In West Sacramento

Copyright 2017 The Associated Press.