Anti-poachers have also used microchips, anti-robbery dye, and apparently poison. http://blogs.scientificamerican.com/guest-blog/2013/05/09/dye-and-poison-stop

Anti-poachers have also used microchips, anti-robbery dye, and apparently poison. http://blogs.scientificamerican.com/guest-blog/2013/05/09/dye-and-poison-stop-rhino-poachers/ http://blogs.scientificamerican.com/guest-blog/2013/05/09/dy... http://www.forumforthefuture.org/greenfutures/articles/turning-rhino-horns-pink-could-disrupt-demand http://www.forumforthefuture.org/greenfutures/articles/turni...