Juveniles have a flattened carapace with three prominent keels. Adults gradually lose these keels and the carapace becomes more domed. Sexual dimorphism between males and females is not obvious. Differences between genders are slight and not expressed until the turtle reaches maturity, at 4 or 5 years of age. Generally, males posses a slightly more concave plastron, longer, thicker tails, and larger claws when mature.
Females have short, stubby tails and shorter claws.
Food Habits Malayan box turtles are very similar in diet to other box turtles, preferring an omnivorous meal. A wide variety of greens are eaten, including vegetables, some fruits, mushrooms, and various aquatic plants. They also feed on waxworms, crickets, fish, and many types of insects. Feeding occurs in the water and accomodates their highly aquatic lifestyle. They do not require food on a daily basis, Malayan box turtles eat twice a week without detrimental effects.