diamondback terrapin hatchling with typical shell markings.
The area is a native nursery for nesting shore birds and diamondback terrapin.
British Dictionary definitions for diamondback
Also called diamondback terrapin, diamondback turtle. any edible North American terrapin of the genus Malaclemys, esp M. terrapin, occurring in brackish and tidal waters and having diamond-shaped markings on the shell: family Emydidae
a large North American rattlesnake, Crotalus adamanteus, having cream-and-grey diamond-shaped markings