Little partridge: When hibernating, its body temperature drops from the usual 40 ° C to about 20 ° C, and the beating sound of the heart cannot be heard with the earpiece. However, as soon as spring arrives, its body temperature rises on its own, and as soon as it wakes up, it spreads its wings and flies high.
Weak Nighthawk: This bird, also known as the North American Nighthawk, when winter comes, they will find a rock crevice or rotten wood cave to hide, and hibernate for up to 5 months. When hibernating, their energy consumption is only 7% of their normal state, and they are in a deep dormant state for up to 100 days. Once hibernation is over, it takes them 7 hours to return to normal mobility.
Swallows: Some swallows that live in northern Europe also gather in groups and go dormant whenever they encounter a cold wave in the summer. At this time, the adult birds of swifts will fly southward, and the newly hatched birds in the nest will go into hibernation, waiting for the parent birds to come back and feed.
Hummingbird: In winter, it enters a state similar to hibernation, called "dormancy". During this period, their metabolism slows down, their respiratory and heart rates drop significantly, and when the weather warms up, they wake up from their "sleep" and begin to replenish the energy they have consumed during a winter.