Formely known as Little Shearwater. 3-4 birds off Graciosa. Images one to four are the same bird which is in active moult. Barolo's Shearwater breed in the Azores from January to June so this moulting bird could be post breeding.
Within the Western Palearctic there are also 'Little Shearwaters' breeding on the Cape Verde Islands. Known also as Boyd's Shearwater, the Cape Verde birds are sometimes treated as a species in their own right or a race of Audubon's Shearwater. It's a complex complex.