Either of two species (Sphenodon punctatus and S. guntheir) of lizardlike, nocturnal reptiles of the order Rhynchocephalia, found on certain islets of New Zealand. Up to 2 ft. (60 cm) long and weighing over 2 lbs (1 kg), tuataras have two pairs of well-developed limbs, a scaly crest down the neck and back, a third eyelid that closes horizontally, and a pineal eye between the two normal eyes. A bony arch behind the eyes distinguishes tuataras from lizards. They eats insects, other small animals, and birds' eggs. In spring, they lay 8-15 eggs away from their burrow. Tuataras may live about 100 years
It reaches a length of two and a half feet, is dark olive-green with small white or yellowish specks on the sides, and has yellow spines along the back, except on the neck