Cory's Shearwater
Calonectris borealis

f7.1 @ 1/8000s, ISO:1000, Nikon D3S w 300mm and 1.7X tele-converter

"Cory's Shearwater," Wikipedia, the free encyclopedia. This shearwater is identifiable by its size, at 4556 cm (1822 in) in length and with a 112126 cm (4450 in) wingspan. It has brownish-grey upperparts, white underparts and a yellowish bill. It lacks the brown belly patch, dark shoulder markings and black cap of the great shearwater.
Offshore, South of Nantucket, Massachusetts