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Thamnophis sirtalis
Melanistic morph of an Eastern garter snake. The snake was sunning itself on a log off the boardwalk near Magee Marsh Wildlife Area, in NW Ohio.
It was sitting on the same stump as another Eastern Garter Snake
Ashley is correct. It is a melanistic garter snake.
http://www.sciencedirect.com/.../pii/S00...
This is an interesting snake for sure! I have another person who thinks this is a garter snake, but let's get a few more opinions. Can never hurt to see what several people think when it's an unusual snake like this :)
And now that you suggested a Garter snake Ashley, I remember that it was sitting on the same stump as an Eastern Garter.
I agree this is not a rat snake. A rat snake doesn't have that keeled of scales, like Lisa mentions. Rat snakes also have slightly shiny scales, which this snake does not. A rat snakes belly is checkboard black and white, your snake has a solid black belly. I'm leaning more towards a melanistic garter snake based on shape over a melanistic water snake, but will show these photos to other people and try to get a few more opinions.