Thermoregulation in the desert iguana Dipsosaurus dorsalis. 
The body temperature of desert iguanas implanted with miniature temperature-sensitive radio transmitters was continuously monitored in their natural habitat.  Extensive thermoregulatory behavior occurred in retreat burrows prior to morning emergence.  Such behavior permits the igluana to emerge from below ground at its preferred body temperature rather than suboptimal temperature at which activity in the burrow is initiated.