Since water balance is extensively discussed in the text of this chapter, suffice it to say here that terrestrial animals face a desiccating force that does not exist in aquatic environments—evaporation. One consequence of the move onto land, then, was facing the physiological demands this implies. At the same time, however, an interesting opportunity was opened. Because evaporation requires considerable heat, terrestrial animals are able to refrigerate their bodies in ways aquatic animals cannot. An animal that can support high rates of evaporation can cool its body considerably below the air temperatures commonly found in terrestrial environments.
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