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Rhino poaching on the increase in South Africa

17 August 2010 Last updated at 13:28 BST

The South African wildlife service says poaching of rhinos is escalating at an unprecedented rate.

More than 150 have been killed so far this year, with many of them targeted in private game reserves.

A reserve just outside Johannesburg has just had its last adult rhino poached as the BBC's Jonah Fisher reports.