Authorities in Africa are reporting that poachers have begun using the tactic of poisoning watering holes in at least five national parks. The result? At least 21 animals have died–including lions, elephants and others. The poison is being unofficially referred to as “Two Step,” because the animals take only a few steps after consumption and then die.

Caroline Washaya-Moyo of Zimbabwe’s Parks and Wildlife Authority says that the poisoning of popular water holes is a new technique for poachers–one that doesn’t involve the noise or commotion of shooting or trapping.

But, there’s a danger to humans as well. Anyone who drinks the water or eats the meat of a poisoned animal is also at risk. As a result, authorities are urging locals, tourists and rangers to carry their own water.

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