The diamondback terrapin is the only North American turtle adapted to live in brackish water, inhabiting coastal salt marshes, estuaries, and tidal flats along the Atlantic and Gulf coasts. Named for the concentric diamond-shaped growth rings on its scutes, this turtle was once hunted to near-extinction for the luxury food market in the early 20th century. Today, populations continue to decline due to habitat loss, road mortality, and drowning in commercial crab traps.
About the Terrapin
Malaclemys terrapin
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💡 Fun Facts
01
Diamondback terrapins are the only turtles in the world that live exclusively in brackish water — neither fully marine nor fully freshwater habitats, but the challenging intermediate zone.
02
Females are significantly larger than males, a reversal of the typical turtle pattern, because larger females can carry more eggs through the high-salinity environment.
03
Terrapins can drink freshwater from rain puddles sitting on the surface of the salt marsh without mixing with the surrounding brine — a behavior called surface tension drinking.
04
They were once considered the greatest American delicacy; at their peak demand in 1920, a single terrapin sold for $120 (equivalent to thousands of dollars today).
05
Female terrapins use a magnetic map sense to return to the exact beach where they were born — sometimes the same stretch of sand — to lay their own eggs years later.
📍 Where to Find This Animal
Habitat Types:
Coastal Salt Marsh & Estuaries
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