The ability to dive and swim under water is a great advantage, giving seabirds access to more food than can be found at the surface. Second only to the flightless penguins, sooty shearwaters, or muttonbirds, are the deepest underwater swimmers – they have been recorded at depths of 60–70 metres. This one is streaking past a diver. Most seabirds are either good long-distance flyers or good divers; unusually, the sooty shearwater is both.
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