Hummingbirds regulate their body temperature during torpor by a combination of behavioral and physiological mechanisms. Behaviorally, hummingbirds may choose to sleep in sheltered areas, such as under eaves or in hollows in trees. This helps to protect them from the wind and rain, which can help to conserve heat. Physiologically, hummingbirds have a number of adaptations that help them to lower their body temperature during torpor. For example, their metabolism slows down, their heart rate decreases, and their breathing becomes shallow. These changes help to conserve heat and energy.