One of the world's last four remaining northern white rhinos has died in a zoo in the United States.
The condition of Nola, a 41-year-old female, had deteriorated after surgery and she was put down on Sunday.
Nola had been a popular attraction at the San Diego Zoo Safari Park since 1989.
The remaining three northern white rhinos - all elderly - are kept closely guarded at the Ol Pejeta Conservancy in Kenya.
