Conservation status: In Decline. Maryland's state reptile is the Diamondback Terrapin (Malaclemys terrapin). It is also well-known as the mascot of the University of Maryland. It is found in the brackish waters of the Chesapeake Bay, including its rivers, tidal marshes, and islands. It may be the only turtle species in the world that lives exclusively in brackish water. Males reach maturity at 3 years old, while females are not fully grown until age 7. A long-lived species, the diamondback terrapin can reach ages in excess of 20 years. Carnivores, ' diet includes mollusks, insects, crustaceans, and small fish.