Poachers are killing 40,000 elephants a year, and with a global elephant population of just 400,000, it doesn't take a mathematician to figure out that there is an urgent need to stop the killing.
But it's hard to catch poachers in the act. They operate over a wide area, move just a few elephant tusks at a time and once their ivory contraband reaches a major port, it can be easily hidden among other goods, said Dr Samuel Wasser, director of the Centre for Conservation Biology at the University of Washington.
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