....that it's a water snake-non venomous....to me,it looks almost nothing like a copperhead-but that's because i've seen hundreds of both,maybe thousands if you include pictures in book,etc....it seems the avg joe/non snake-lover type can confuse anything with a copperhead.the top of a copperhead's(or a cottonmouth for that matter-both 'agkistrodon' species) head is flat,eyes set on the sides.a water snake's are sort of more towrds the top,and the sides of the head don't meet the top at such a right angle as on a copperhead....nerodia(water snakes),like all 'non-hots'(non venomous snakes) in your area,have round pupils.all the hots in the u.s. except the coral snake have vertical/eliptical pupils(like a cat's)....the hots have a fairly triangular head THAT IS ALSO MUCH WIDER THAN THE NECK at all times,not just when they're trying to 'look scary' like many non-hots will do,including your water snake....and yes all the hots but the coral snake have heat-sensing pits betweeen the eye and nostril on each side of the head....but the only reason you would likely ever get bitten by a venomous snake,is if you're trying to handle it,or if it feels totally trapped/cornered.
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"with head raised regally,and gazing at me with lidless eyes,he seemed to question with flicks of his long forked tongue my right to trespass on his territory" Carl Kauffeld