Long but worth it, Backchannel has a comprehensive update on drones used to combat poaching on land and sea. One interesting data point:
One pilot project in a protected area in Kenya saw a 96 percent reduction in poaching after it began patrolling with drones. Ditto with a WWF-funded project in Nepal, although in the Nepalese case, the drones were part of a larger overhaul in how rangers conducted their business. These successes, plus various other projects in the works, raise the possibility of a major advance in conservation — a leap enabled by drones.