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Elephant calves orphaned by wildlife poaching

12 February 2014 Last updated at 00:16 GMT

Prince Charles, David Cameron and the Duke of Cambridge are among those hosting an international conference in London on Thursday aimed at halting wildlife poaching.

The practice, worth an estimated £12bn ($19bn) per year has soared as the demand for ivory in China rises.

A kilo of ivory sells for about £140 ($230) in China, while rhino horn can fetch over £12,000 ($20,000) per kilo.

Kenya has been one of the biggest victims of poaching.

Our correspondent Mark Lowen visited an elephant sanctuary in Nairobi National Park to see the effect.