Some water moves through the skin of mammals by insensitive diffusion. Most of the water, which passes through the skin, however, does so in the form of active sweating. Larger mammals usually sweat to dissipate heat. Among the domestic species, both camels and cattle have adopted this mechanism. A characteristic of the camel is that there is no copious flow of sweat or obvious wetting of the hair. The evaporation takes place at the surface of the skin and not at the extremities of the hair. The latent heat of evaporation is therefore drawn from the skin rather than from.
