Media playback is unsupported on your device

Rhino horns sold on black market in Asia

11 February 2014 Last updated at 00:02 GMT

Britain is to play host to a gathering in London in a bid to get an international agreement to stop the illegal trade in wildlife.

The trade is estimated to be worth more than £6 billion a year, with animals dying in great numbers to meet an appetite from unscrupulous dealers supplying people mainly in Asia.

Sue Lloyd-Roberts reports from Vietnam for Newsnight.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.