''Sphenodon'' is brownish or greenish animal.<ref name=ASRLI/> Males are larger in size than females. The average length of an adult male is approximately 61 cm and adult females are 45 cm in length.<ref name=encyclo>Cree, Alison. 2002. ''Tuatara.'' In: Halliday, Tim and Adler, Kraig (eds.), ''The new encyclopedia of reptiles and amphibians'', Oxford University Press, Oxford, pp. 210-211. ISBN 0-19-852507-9 </ref> The snout of the animal is long and the jaws are powerful. The four [[limb]]s are strongly built and the feet are partially webbed each having five toes. Each toe has a sharp claw. These animals weigh about one kilogram.<ref name=ASRLI/> A characteristic of this animal is parietal eye the purpose of which is believed to help with thermoregulation.<ref name=encyclo/> The pineal eye is also known as third eye which is visible in young animals, but it becomes covered with [[skin]] in adults.<ref name=ASRLI/> Tuatara have the slowest growth rates among reptiles.<ref name=encyclo/> | ''Sphenodon'' is brownish or greenish animal.<ref name=ASRLI/> Males are larger in size than females. The average length of an adult male is approximately 61 cm and adult females are 45 cm in length.<ref name=encyclo>Cree, Alison. 2002. ''Tuatara.'' In: Halliday, Tim and Adler, Kraig (eds.), ''The new encyclopedia of reptiles and amphibians'', Oxford University Press, Oxford, pp. 210-211. ISBN 0-19-852507-9 </ref> The snout of the animal is long and the jaws are powerful. The four [[limb]]s are strongly built and the feet are partially webbed each having five toes. Each toe has a sharp claw. These animals weigh about one kilogram.<ref name=ASRLI/> A characteristic of this animal is parietal eye the purpose of which is believed to help with thermoregulation.<ref name=encyclo/> The pineal eye is also known as third eye which is visible in young animals, but it becomes covered with [[skin]] in adults.<ref name=ASRLI/> Tuatara have the slowest growth rates among reptiles.<ref name=encyclo/> |