Buller's Shearwater breeds on the Poor Knights Islands of New Zealand and migrates to the North Pacific outside the breeding season. At sea it feeds on krill and small fish, among other prey.
It is a large but lightly built shearwater, similar in size and shape to the Wedge-tailed Shearwater.
It feeds at sea on krill, small fish, salps, and jellyfish. At breeding colonies it nests in burrows, rock crevices, or ledges, often sheltered by vegetation.
An extinction-risk assessment has not been added yet.