Abstract: Daily torpor in mammals is characterized by temporal reductions in body temperature and metabolic rate during a day, and is an important survival strategy for mammals to cope with the adverse environmental conditions such as cold climate and food shortage. In this review, we analyze the taxonomic classification, geographical distributions, living environment, body size and diets, body temperature and metabolic rate in nearly a hundred species of daily torpid mammals reported in the literatures. Daily torpid mammals are subordinate to marsupials (Marsupialia) and placentalia (Placentalia); these species are mostly distributed in temperate regions (latitude range from 20° S to 30° S and longitude from 30° N to 40° N), where the environmental conditions varied seasonally and diurnally. Daily torpid animals are relatively smaller, and they need nutritionrich foods. Almost every herbivorous animal cannot significantly reduce their body temperature. For daily torpid mammals, the average body temperature is 19.75 °C and the metabolic rate during torpor is 34% of basal metabolic rate. Revelation of the mechanism of low metabolism and hypothermia in daily torpor will provide important theoretical and practical significance for human health and biomedical research.

Key words: different precipitation pattern years, sustainability index, optimum economic fertilization, coefficient of variation