The body temperature of bats varies greatly, reaching 56℃ (from -7.5℃ to 48.5℃). Due to the differences in physiological and behavioral characteristics, the body temperature of some large fruit bats is relatively constant, while most small insect-eating bats are typical heterotemperature animals.
It is observed that bats living in temperate zones spend much more time inactive than active in their lives. In summer, they sleep almost all day and part of the evening. When the weather is cold, some species, like birds, make long-distance seasonal migration and go to the south for the winter, while those who stay in place go into long-term hibernation in the cold winter.
According to incomplete statistics, the big-eared bat and the northern brown bat living near Leningrad sleep only115 ~1/20 of their lives, and sleep the rest of the time (Kujiajin, 1959).
When the ambient temperature reaches 16~28℃, bats are in a deep sleep state, their physiological functions slow down and their metabolism decreases. Because of low metabolic consumption, some bats live longer.
Feeding habits and social skills of bats;
70% bat species mainly feed on insects and other small arthropods; Other species mainly feed on fruits, nectar and pollen. Some tropical species are carnivores, and three vampire bats feed on blood.
Bats can also talk. Some social signals can be used to attract mates, defend food, summon the same kind and expel some bats. These signals are usually emitted at very low frequencies (sometimes people can hear them), so these sounds can travel far.
At the same time, these sounds will be different because of the difference of vocal bats. For example, when a baby bat is separated from its mother bat, it will send out a "lonely signal", and the mother bat will quickly distinguish whether it is her own baby or not according to the different sounds. In addition, many small bats are also sensitive to the echo frequency they often use.