Texas Cooter vs. River Cooter

The two big cooters of central Texas rivers; they meet in the Brazos and Colorado systems. A: Broad yellow bars and blotches behind the eye in the Texas Cooter; many thin, even yellow stripes in the River Cooter. B: Whorls and rings, no single C in the Texas Cooter; a yellow C-shaped mark, open toward the rear (clearest in the young) in the River Cooter. The Texas Cooter's upper jaw has a notch at the tip with a point on each side.

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

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