[joshdulac]

Anti-poachers have also used microchips, anti-robbery dye, and apparently poison.

http://blogs.scientificamerican.com/guest-blog/2013/05/09/dy...

http://www.forumforthefuture.org/greenfutures/articles/turni...

[fujiuji]

Drones as well: http://www.telegraph.co.uk/news/worldnews/africaandindianoce...