A thirty-foot sperm whale comes up for air. Before slipping back into the deep blue its eye gleans sight of something strange in the distance. To the whale, it looks like a flock of seagulls, each with three wings flapping. For some reason, they can’t take off.She doesn’t pay them any mind. She’s busy with a calf to feed, her third in the past decade. When she was a calf herself, the three-winged seagulls weren’t there. But she is spotting more and more of them as she swims off the coast of Long Island these days.