The sweat glands of many mammals aid thermoregulation through evaporative cooling.

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"Sweat glands play an extremely important part in temperature control. Shaped like a tube, knotted at the bottom and opening out of the epidermis at a 'pore', sweat glands secrete a colourless liquid which evaporates on the surface of the skin removing excess heat…There are two kinds of sweat glands: apocrine, associated with hairy skin, and eccrine, associated with smooth. Apocrine glands seem to be concerned mainly with producing scented secretions, and are progressively replaced in the more advanced mammals - gorillas, chimpanzees, and especially man - with eccrine glands, whose secretion dilutes and spreads that of the apocrine glands." (Foy and Oxford Scientific Films 1982:79)

"From the evidence of comparative mammalian physiology, we suggest that the very common apocrine sweat gland is not primitive but is both specialized and efficient as a cooling organ in an animal with a heavy fur coat and relatively slow movement. The remarkable thermal eccrine sweating system of humans probably evolved in concert with bipedalism, a smooth hairless skin, and adaptation to open country by the ancestors of H. sapiens." (Folk and Semken 1991:185)

The grand design: Form and colour in animalsJuly 2, 1983
Sally Foy

Journal article
The evolution of sweat glandsInt J BiometeorolJanuary 26, 2005
G. Edgar Folk, A. Semken

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