Seabirding on Monterey Bay is rarely dull! Images below, copyright Quinn Passey are of an apparent leucistic PINK-FOOTED SHEARWATER. This bird flew into the wake on Shearwater Journeys' September 12, 2010 Monterey Bay pelagic trip. Although I have seen and photographed dark Pink-footed Shearwaters, I have never seen one that looked like this individual.
The image, below, was shot by Vaughan Ashby of Birdfinders.
Kind of an amazing individual.