The black mocassin has the same body shape as a copperhead, but is dark brown or black with white or off-white banding. These snakes have a reputation for being aggressive and nervous but are generally shy unless threatened. Taylor's cantil has similar coloration and is found only in northeast Mexico. Across Mexico and, in the case of the black mocassin, Central America, these snakes are the most feared reptiles. Their bites cause swelling, edema, and kidney failure and can lead to necrosis, amputation, and death.

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