Eastern Mud Turtle

Fascinating facts about the Eastern Mud Turtle

• A carapace barely the size of a matchbox, just 3–4 in (7.6–10.2 cm), makes the eastern mud turtle very small among freshwater turtles in the United States.
• Home ranges can shrink to .05 ha or expand to 69.5 ha depending on how close food, water and shelter are, illustrating the species’ flexibility in exploiting both cramped garden ponds and sprawling wetlands.
• Females lay 2 to 5 eggs per clutch and can produce at least three clutches each year, with cooler-latitude turtles laying more eggs per clutch, revealing a direct link between climate and reproductive output.
• Eggs hatch after 76 to 124 days, and hatchlings emerge with a carapace wider than the egg itself, so the shell unfolds like a tiny parachute, a clever adaptation that lets them slip into water immediately.
• In a South Carolina study, the survival of eggs to hatchling emergence was 26.1 %, more than double the 10.5 % rate recorded for nearby painted turtles, highlighting the mud turtle’s surprisingly high early-life resilience.

At a glance

About the Eastern Mud Turtle

The eastern mud turtle, Kinosternon subrubrum, is a diminutive freshwater turtle that often slips unnoticed beneath the water’s surface. Measuring just 3–4 in (7.6–10.2 cm) in carapace length, its shell is keelless and ranges from yellowish to black, while the large, double-hinged plastron can be yellowish to brown and sometimes bears a dark pattern. Its chin and throat display a mottled yellow-grey with brown streaks, and its webbed feet end in eyes whose iris glows yellow with dark clouding. Though rarely seen basking, when it does, it perches on floating debris or rocks, a brief glimpse of its otherwise secretive life. In the spring-fed streams, ponds, lakes, ditches and swamps of the southeastern and northeastern United States, it favors densely vegetated, clean, oxygen-rich waters, burrowing into sandy-muddy banks to hibernate just 1.3–3 cm below the surface, often near leaf and pine litter about 70 m from wetlands. Its diet is a true omnivorous buffet, small aquatic insects, algae, crustaceans, mollusks, amphibians, carrion, and aquatic plants, shifting to larger prey as the turtle grows, a flexibility that lets it thrive even in brackish or polluted waters. A surprising trait is its seasonal migration: individuals traverse up to four habitat types across uplands and wetlands during summer and fall, moving home ranges that can be as tiny as .05 ha or as expansive as 69.5 ha depending on resource distribution.

More reptiles to discover

Browse Feravox