Sweat glands are present all over the skin, where sweat production varies f
rom 4.98 to 73.36 g m(-2)h(-1) of skin. Ambient temperatures between 20 and
33 degreesC are the main stimuli for activation of sweat glands, generatin
g a heat loss ranging from 11.9 to 37% of standing basal metabolic rate. Re
spiratory water loss is not an important mechanism for heat dissipation. Wa
ter loss is controlled by postural changes in the guanaco. (C) 2001 Elsevie
r Science Ltd. All rights reserved.