# Transcript

NARRATOR
This lizard is a desert iguana. As before, its temperature is measured using a thermistor inserted into its cloaca. The high temperature doesn’t seem to bother the lizard at first. But as its body temperature rises, notice the changes in posture that minimise contact with the hot surface – and gaping, another means of losing heat. But to avoid becoming too hot or cold, it must shuttle between the compartments.