Salvin's Prion Pachyptila salvini

A pale powder-blue-and-white seabird with a faint grayish dark “M” across the upperwings. Note the dark blue “thumb mark” collar, the blue eye-stripe, the white eyebrow, the white throat, and the grayish cap. Almost identical to Antarctic Prion, but bulkier and more heavy-chested, with a slightly wider bill. Essentially identical to MacGillivray’s Prion, with which it shares the breeding island of Gough, in the South Atlantic; MacGillivray’s has a slightly broader bill, but identification likely to be impossible at sea in most cases. Present species also breeds on the Crozet and Prince Edward Islands, and ranges from off southern Africa to New Zealand.