Alabama Map Turtle vs. Northern Map Turtle

Both are map turtles of big rivers; they meet where the Tennessee and Mobile river systems come close in Alabama. A: A big yellowish-green blotch between the eyes, joined to the blotch behind each eye in the Alabama Map Turtle; only a small yellow spot behind each eye in the Northern Map Turtle. B: A row of knobs along the keel, with a black stripe in the Alabama Map Turtle; a low keel without big knobs in the Northern Map Turtle. C: Huge, broad heads in the Alabama Map Turtle; heads big but not as broad in the Northern Map Turtle.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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