Box Turtles are the most common terrestrial turtle in the eastern United States. They are small to medium sized turtles, attaining a maximum length of about 8 inches and having a highly domed carapace. A key characteristic of box turtles is their hinged plastron (bottom of the shell) that can be shut completely to exclude predators. Although mud, musk, and blandings turtles also posses hinged shells, they cannot be closed completely. Superficially, box turtles resemble tortoises but they are actually more closely related to many aquatic turtles and belong to the same family as spotted, bog, chicken, map, and painted turtles, as well as sliders, cooters, and diamondback terrapins. Box turtles in the United States are divided into two species, the eastern box turtle (Terrapene Carolina), which ranges from Texas throughout the southeast and north to Michigan and southern Massachusetts, and the western box turtle (Terrapene ornata), which ranges west of the Mississippi to Colorado and New Mexico.