Other Names: Dusky-backed Shearwater
Distribution: Poorly understood; believed to live year-round in tropical waters across the Indian Ocean north to the Arabian Sea, throughout the northwest and central Pacific, in the Caribbean, and parts of the eastern Atlantic.
Size: 31-32 cm in length with a 69-70 cm wingspan. Adults average 150–230 g.
Plumage: Mostly greyish-brown; undersides vary from light gray to white. The throat and underside of the face are white. The bill and legs are greyish-brown and the eyes are black with white eyerings.