Very similar to Band-rumped and Monteiro's Storm-Petrels, and closely related to those taxa. Breeds only on Cape Verde islands. There are no published field identification features to tell them apart. However it appears that its upperwing pattern is more contrasting and the rump patch is broader. Breeds in burrows and crevices on islands. Burrow calls are different from Band-rumped and Monteiro's by being extremely long, without pauses.