- Pterodroma cookii
- Slatey-grey back and upperwings (browner in worn plumage)
- Black M pattern on wings
- White underparts and underwings
- White face
- Dark mask
- Grey tail
- Central feathers white edged and black-tipped
- Black bill
- Blue-grey legs and feet
Breeds islands off New Zealand; ranges to eastern and northern Pacific.
Subspecies orientalis is generally considered invalid.
The diet includes crustaceans, squid and fish.
It nests in crevices and burrows.
- Clements, JF. 2010. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2010. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist/Clements%206.5.xls/view