As BigDaddyT noted, the latest demand for rhino horn is eing driven by a rumor that it cures caner. Viagras had made a big dent in the "traditional" medicinal market, but the cancer rumor went Internet viral and the price for horn skyrocketed.
I hunted the Selous Reserve in Tanzania last September and the head game scout in camp told me they're guarding the remaining black rhinos 24 hours a day. We ran into a party of half a dozen poachers midway through the hunt, disappearing into the bush. An anti-poaching team caught them the next day and killed five out of the six.
