Cape Cod National Seashore serves as a very important area for reptiles. It is one of the few remaining places in the region where species once common, remain common. In addition to the five species of migratory marine turtles that forage in the offshore waters of the park, there are thirteen species of reptiles that live out their entire lives here. Many of these species play an important ecological function, consuming large quantities of small prey items, such as insects, and serving as prey for larger species of wildlife.
The terrestrial eastern box turtle is a species familiar to most people. It has declined throughout much of its range in the eastern United States due to habitat loss, road kill, and pet collection. Fortunately, road kills seem to be infrequent here, and it still appears to be fairly common throughout the National Seashore. Recent surveys suggest that the National Seashore supports some of the densest populations of box turtles in Massachusetts.