Blue-footed boobies hunt by plunge-diving into the ocean from heights of 30 meters (100 feet) to capture fish, often hunting in groups and communicating with whistles. The species is adapted for diving and swimming; its nostrils are permanently closed, and it possesses a specialized air sac in the skull. This air sac protects the bird from the impacts associated with striking the ocean and the pressures that come with swimming as deep as 25 meters (80 feet) below the surface.
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