Bannerman's Shearwater is endemic to the Ogasawara Islands. Breeding colonies have been confirmed in forests on Minamiiwoto and Higashijima.
The Forestry and Forest Products Research Institute describes the bird as a small shearwater with black-and-white plumage.
Surveys confirmed breeding colonies in forests on the uninhabited islands of Minamiiwoto and Higashijima in 2007.
An extinction-risk assessment has not been added yet.