Photograph: Image by Jacquelyn Guzy and text by Leigh Anne Harden. Adult female Diamondback Terrapin (Malaclemmys terrapin) at sunset in a South Carolina tidal creek. The individual in the image has been captured several times as part of a long-term capture-mark-recapture research project on Kiawah Island, SC. From Texas to Massachusetts, Diamondback Terrapins occupy brackish coastal waters where they consume mostly mollusks and crustaceans. Females are larger than males and have proportionally broader heads than do males.