Northern white rhino dies in US, leaving only three alive ....

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.

There are about 20,000 southern white rhinos in the world, but studies are still taking place to determine whether the subspecies are genetically similar enough for the surrogacy to work.

Zoo researchers say that, if successful, the programme could see a northern white rhino calf born within 10 to 15 years.
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Source
BBC