Diamondback Terrapins are the official state reptile of Maryland, which is fitting as they prefer the brackish waters of the Chesapeake Bay. They can be identified by the distinctive diamond-shaped pattern on their shells.
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Some quick facts about Diamondback Terrapins.
https://www.discoverwildlife.com/animal-facts/reptiles/facts-about-diamondback-terrapins/
The US Fish and Wildlife Service provides some great information about the Diamondback Terrapin.
https://www.fws.gov/international/cites/cop16/diamondback-terrapin.html
Video of Diamondback Terrapins nesting.
https://www.fws.gov/international/cites/cop16/diamondback-terrapin.html