Answer:
An animal that uses torpor, a type of hibernation, to conserve energy is a hummingbird.
Step-by-step explanation:
Torpor is a state of decreased physiological activity in an animal. It is a short-term adaptation to harsh environmental conditions such as low temperatures or food scarcity. Hummingbirds use torpor as a way to save energy when food is scarce. During torpor, a hummingbird's metabolic rate can decrease by up to 95%, which means it can reduce its energy consumption by a significant amount.
In torpor, the bird's body temperature drops, and its heart rate and breathing slow down. This state is not as deep as hibernation, but it can last for several hours or even days, depending on the circumstances. When the environmental conditions improve, the bird can quickly wake up and resume its normal activity.
Thus, the hummingbird is an animal that uses torpor to conserve energy.