they would have dehydrated very quickly, as water and salt are needed within the body in hot conditions. Another way that humans lose salt and water is through the tear ducts. Humans cry tears of emotion and tears in response to a stimulus such as smoke or dust, no other land mammal does this. There are however marine mammals that can do this such as a walrus, they can weep due to excitement when feeding or weep when they have induced too much water and the body tries to expel some of it. The aquatic ape theory argues that in order for the aquatic apes to lose the excess salt ingested in the salty environment these adaptations were necessary. The human body has another type of gland that secretes oil known as sebum. Other primates such as chimpanzees have these glands although theirs are very small whereas the human glands are enormous. The aquatic ape theory leaflet states that "the only known function of sebum is that of waterproofing the skin or fur".
             The savannah theorists believe that apes lost th
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