The link below is to an article about the threat posed to Rhinos in India by the weed Mimosa diplotricha. According to the article poaching is somewhat under control (poaching for horns), but now the Rhino is threatened by the rapidly spreading Mimosa weed that is smothering out grasses that provide feed for the Rhino.
For more visit:
http://ipsnews.net/news.asp?idnews=106803
Kevin's Walk on the Wild Side 