Other Names: none
Distribution: Deep waters of the Northern and Eastern Pacific.
Size: 26-31 cm in length with a 53-66 cm wingspan.
Plumage: Top is dark gray with a with sharp black “M” mark. There is a bold and very dark grey cap and mask, extending into a dark grey half collar on the upper part of the breast. They have a dark gray rump and tail, white throat and underside. The underside of the wing is primarily white, with a black tip and narrow black trailing edge, extending to the leading edge with a slight thickening at carpal joint.