I have twice seen hots confused with hogs..
I was hunting for kennerlyi in Van Horn, Texas one morning and seeing no snakes. Right as I was headed back towards home, I came up on a 18 inch snake flattened out on the road. I looked out the truck window and said "Hognose"! I was pumped.
I jumped out and was ready to reach down and pick up the hog when I realized I was about to pick up a yearling prairie rattlesnake! (I did find my first kennerlyi about 5 minutes later).
A few years later, a friend and I were herping in N. Florida, hoping to find eastern or southern hogs. We came across a huge piece of a roof laying alongside a dirt road. It took two of us to pick it up and as we held it up, I said "nothing". My friend said, "OK then, just pick up that hognose for me then". I looked and there at the edge of the board was the posterior part of a grayish eastern Hog. I was surprised I hadn't seen it, but I let him hold up the roof while I reached for it. As I bent down to pick up the hog, I realized it was a pygmy rattlesnake.
I have also seen Western Massasaugas on the road that I thought were hogs at first glance.
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Chris Harrison