Chicken Turtle vs. River Cooter

Both have yellow-striped heads and necks; they meet from eastern Oklahoma to the Gulf. A: Very long and thin, nearly as long as the shell in the Chicken Turtle; of ordinary length, with many thin stripes in the River Cooter. B: A faint net of pale lines and a yellow rim; no C mark in the Chicken Turtle; a pale C-shaped mark on the second side plate in the River Cooter. Cooters grow to 12 in or more; Chicken Turtles rarely over 10.

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

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