Four days out of Peru, on March 19, 2010, the "advance team" of three swallowtail gulls arrived just before sunset, wafting aloft on the high thermals, well above Ocean Watch's mast. The birds were like a trio of Indian scouts atop a Western mesa, taking the measure of the stagecoach snaking through the canyon. Once they had a bead on the situation, they disappeared, stealthily, to the west. They'd be back in a few hours, with reinforcements. They weren't after homesteaders, or even sailors; they were interested in smaller, more delectable prey: flying fish.