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Why do animals with negative buoyancy need energy to stay at one depth in water?
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Locomotion
These birds largely reside in coastal areas of North America, although some populations live in the continent's interior along large rivers.
Animals with negative buoyancy sink because their body weight exceeds the weight of the water they displace. Because they are not weightless, they are subject to the force of gravity, which pulls them downward. Consequently, these animals must expend muscular energy to counteract this sinking force and remain at a specific depth in the water.1