Tuatara

Tuatara are reptiles endemic to New Zealand. Despite their close resemblance to lizards, they are part of a distinct lineage, the order Rhynchocephalia. The name tuatara is derived from the Māori language and means "peaks on the back". The single extant species of tuatara is the only surviving member of its order. Wikipedia

Scientific name: Sphenodon

Average lifespan: around 60 years

Tuatara are greenish brown and grey, and measure up to 80 cm (31 in) from head to tail-tip and weigh up to 1.3 kg (2.9 lb) with a spiny crest along the back, especially pronounced in males. They have two rows of teeth in the upper jaw overlapping one row on the lower jaw, which is unique among living species. Tuatara are New Zealand's largest reptile. Adult males measure up to about: 0.5 metres in length, and. weigh up to 1.5 kg when fully grown.