How many tuatara can occupy one burrow system?

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

Although tuatara are solitary and territorial animals, as many as five or six individuals may occupy the same burrow system. These systems typically consist of a network of interconnected tunnels, and while multiple tuatara may inhabit the same system, they do not share the same tunnel segment.1