Bryan's Shearwater is a small shearwater with a relatively long tail. A nest has been confirmed on Higashijima in the Ogasawara Islands, but its range and life at sea remain poorly known.
It is small for a shearwater, dark above and white below, with a relatively long tail. The dark undertail and bluish legs are also noted as identification features.
At Midway Atoll, an individual was recorded calling from a crevice among concrete and coral rubble. Its foraging and life history at sea remain unknown because confirmed records are lacking.
An extinction-risk assessment has not been added yet.