![Graphic][1] As is often the case for animals living in extreme environments, desert birds face a choice between two competing physiological needs: in their case it's staying cool (which uses… Click to show full abstract
![Graphic][1] As is often the case for animals living in extreme environments, desert birds face a choice between two competing physiological needs: in their case it's staying cool (which uses up a lot of body water) versus staying hydrated. Birds deal with this trade-off in different ways:
               
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