Singapore - Sheba, the Singapore's Zoo's polar bear, has passed away, according to a statement from Wildlife Reserves Singapore.
She had been undergoing treatment for the loss of strength in her hind limbs since September, but in the past week her condition deteriorated.
A close evaluation revealed her prognosis was poor, and the polar bear had to be euthanised on humanitarian grounds, said the statement.
Sheba was 35 years old when she died. The normal life span of polar bears in captivity is 25 years.
Wildlife Reserves Singapore said it is extremely saddened by the passing of their beloved polar bear.
Sheba first arrived at the Singapore Zoo on April 14, 1978 from Cologne Zoo, Germany. She was just 14 months old.
She was the first polar bear to successfully raise a cub in the tropics.
Her son Inuka continues to reside in Singapore Zoo, and is now 21 years old.