Fig. 2

Research status on the body temperature of bats. A The proportion of the bat species from different families that the body temperature was measured. ‘Other families’ includes the families in which the number of species is less than six. B Counts of the studies on bat body temperature every decade since the year 1930, as well as the number of studies grouped by the measurement technique for each study. C Counts of the studies based on the measurement technique for both the laboratory and field studies. D Counts of the studies based on the behavior of the bats for both the laboratory and field studies. ‘Roosting’ behavior describes the studies that were carried out for bats at the roost and the bats can show both hanging and flying behavior, although the specific behavior of the bats during the recording was typically unknown. Seven of the studies used two measurement techniques and these studies were counted as two separate studies. Both the ‘Telemetry’ and ‘Onboard logger’ technique rely on miniature temperature sensors attached to the bat