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The tuatara is a reptile endemic to New Zealand which, though it resembles most lizards, is actually part of a distinct lineage, order Sphenodontia.
This is Henry, he is housed at the Southland Museum and Art Gallery in Invercargill, New Zealand. He was 111 years old when I took these photos. He is part of their breeding program.
Henry is believed to be the oldest Tuatara. The jaw bone was on display in the Tuatara viewing area at the Southland Museum. It shows how it is actually their jaw bone that is serrated, because Tuataras ancestors separated from other related species before the development of teeth. The tuatara has a third eye on the top of its head called the parietal eye. It has its own lens, cornea, retina with rod-like structures, and degenerated nerve connection to the brain, suggesting it evolved from a real eye. The parietal eye is only visible in hatchlings, which have a translucent patch at the top centre of the skull. After four to six months, it becomes covered with opaque scales and pigment. Its purpose is unknown