Plunge-diving by gannets Morus is one of the most spectacular examples of specialist feeding by birds. Dives may commence from 30 m above, and reach depths of 30 m below, the water surface. To improve our understanding of the biomechanics of plunge-diving, RopertCoudert and his colleagues studied free-flying Cape Gannets M. capensis from three islands off South Africa. Birds trapped at or near the...

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