Emydidae | box turtle
A "land turtle" with a high, domelike shell and an extremely variable coloration and pattern. Both upper and lower shells may be yellow, orange, or olive on black or brown; either dark or light colors may predominate. Four toes on each hind foot.
Male: rear lobe of plastron with central concave area; eyes sometimes red.
Female: Plastron flat or slightly convex; eyes normally brown.
Young: Shell much flatter; mostly plain grayish brown, but with spot of yellow on each large scute
Conant, R., & Collins, J. T. (1998). A field guide to reptiles & amphibians: eastern and central North America (3rd ed.). Boston: Houghton Mifflin.