I'm think'n (baby)Timber Rattler (poisonous) or rat snake (not poisonous), dont know bout' Arkansas, but in Louisiana it is most common to find a Pygmy Rattler under dried cow dung. Colors don't match a copperhead, or coral, could be a breed of king snake, cottonmouth aka. stumptail, mud moccasin, water moccasin (never heard of one in a tree, unless it was a low branch hangin over a creek). We also have Canebreak Rattler here, pretty popular in Angie, so I watch every step I take till a good freeze comes, have one skinned out, had 13 rattlers and a button, 7' 11'' long, 1 1/4 fangs, makes my leg hurt typing this....&^%#