“A picture is worth a thousand words.”
A few days ago, a Copperhead was killed in the nearby Rainbow’s End RV Park. I’m researching in an effort to identify my visitor. I cropped my telephoto images to get a better look at the markings. I’ve read half-a-dozen web sites and (at 7:15 PM) do not have an answer.
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Postscript, Tuesday, May 24th, 2016: Knowledgeable folks tell me the visitor is/was a harmless Texas Rat Snake. ~~ A Texas native quoted this old saying: “Red next to yellow kills a fellow. Red next to black is a friend to Jack.” An Internet search produced this valuable information. (My visitor doesn’t appear to have red, yellow or black but the article is [imho] very interesting.)