Other Names: Gray-backed Shearwater, New Zealand Shearwater
Distribution: most of the central and eastern Pacific Ocean, north to Alaska and south to encircle New Zealand. Breeds exclusively on the Poor Knights Islands.
Size: 46-47 cm in length with a 97-99 cm wingspan. Adults weigh 342-435 g.
Plumage: The upper back is bluish gray. A blackish stripe runs along the leading edge of the wings. The upper wing mantle is black also, but the two black areas do not meet at the hand; the area between them is light gray to white, creating a distinct diagonal stripe down the wing that is visible in flight. The underside is bright white on both the wings and main body. The tail is white at the base and black at the tip.