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and physiological adaptations to their aquatic habits. They have evolved solid bones to reduce their buoyancy, and their wings are relatively short but strongly muscled, enabling them to be used as flippers underwater. The plumage is dense, with a large preen gland for waterproofing their feathers. Relatively long legs and sharp claws enable them to hold on to rocks in swift water. Their eyes have well-developed focus muscles that can change the curvature of the lens to enhance

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