How do fairy prion burrows provide food for tuatara?

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

Fairy prion burrows provide a vital food source for tuatara by supporting a robust ecosystem within the tunnels. The excreta produced by the fairy prion birds nourish a large community of arthropods, which the tuatara then hunt. Additionally, tuatara prey on the smaller lizards that inhabit these burrows, and they may also consume the eggs and chicks of the fairy prions themselves.1