No. Some animals are classified as "deep hibernators". Deep hibernation is a state in which an animal is inactive for many days or weeks. In deep hibernation the animal's body temperature drops to around five degrees C. Deep hibernation has also been called "true hibernation". Other animals exhibit a less profound inactive state called "torpor". Torpor may be very short-term (the cold hours of the night, for example) and involves the drop of the animal's body temperature to no less that fifteen degrees C. An animal in torpor is also capable of relatively quick arousal.