How large can an adult tuatara grow?

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tuatara (Sphenodon punctatus) — tuatara The species is the sole living member of the reptile order Rhynchocephalia.

Adult tuatara typically reach an average length of 50 cm (20 inches) from the snout to the tip of the tail, with weights ranging between 0.5 and 1 kg (1 and 2 pounds).1

Males are generally larger than females and often grow to approach 60 cm (24 inches) in length.1