Rare Rhino Dies at San Diego Zoo

SAN DIEGO — A rare northern white rhinoceros died Wednesday at the San Diego Zoo, dwindling the critically endangered species' population to as few as 13 worldwide, zoo officials said.

Nadi was one of three northern white rhinos at the zoo's Wild Animal Park. No cause of death was given, but the female rhino had shown signs of old age, the zoo said in a statement.

Pictured: Nadi the white rhinoceros showing signs of aging.