Nature & Environment
Animals at the extremes: hibernation and torpor
...family Trochilidae) studied to date, torpor, if it occurs, takes place on a daily (or more usually nightly) basis. They are able to re-warm themselves independently of T a and show an increased thermogenesis if T a falls below 18° C during the time when the bird is not searching for food. The tiny rufous hummingbird (Selasphorus rufus; Figure 3), weighing only 3.0–5.5...