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Postures varying with the environment
The pink flamingo (Phoenicopterus roseus) stands upright by folding its long, featherless leg to conserve as much heat as possible, thus minimizing the heat exchange, especially when in water. The flamingos, therefore, sleep on one leg less often when the air temperature is high and fewer flamingos sleep this way on land than in water. However, sleeping lying down would put them more easily at the mercy of a predator.
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