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Anonymous
I don't know if you could consider it a system, but there actually are important behavioral adaptations that desert animals use such as: finding shade, digging burrows, hibernating through dry or hot periods, sleeping through the day, etc.
Otherwise, maybe you could conceive of a mammal that somehow adapted to dispose of nitrogenous wastes as uric acid rather than urea, like birds which saves water tremendously, but... you'd have a damn hard time explaining that phylogenetically.
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