Joel Sartore / Photo Ark / Big claw crayfish (Faxonius placidus) female, Upper Duck River form, portrait, Tennessee, USA.

Joel Sartore / Photo Ark / Central American mud turtle (Kinosternon angustipons) male, underwater portrait, Turtle Island, Austria. Captive, occurs in Central America.

Joel Sartore / Photo Ark / Brazilian snake-necked turtle (Hydromedusa maximiliani) portrait, Turtle Island, Austria. Captive, occurs in Brazil.