Years ago, when I was doing herpetological fieldwork, I collected a lot of pit vipers, mostly rattlesnakes and copperheads. Of course, they should be left alone. And they can get huge. When I was collecting specimens for the University of Michigan, back in the late 1950s, I would capture Western Diamondbacks in Texas, which would be under the large metal feed bins on ranches. Some of these were between five and six feet long. And what was most amazing was not their length, but their girth, approaching the width of a medium-sized thigh. They were both heavy and dangerous.