Fig. 2

Examples of variable patterns of torpor expression, defined by reductions in body temperature (solid lines). Ambient temperatures are represented by the dotted lines and night and day are illustrated by the grey and white bars, respectively. Shown are: (a) an Australian daily heterotherm showing one short torpor bout (Petaurus breviceps, Order: Diprotodontia, Nowack unpublished data); (b) an opportunistic hibernator from Australia showing a bout of multiday torpor (Nyctophilus bifax, Order: Chiroptera, Stawski and Geiser unpublished data); (c) a thermo-conforming tropical hibernator from Madagascar during hibernation, the data shown are from a multi-day torpor bout with a single bout of activity occurring the night of the 23rd of September (Setfier setosus, Order: Afrosoricida, data from [55]); and (d) a food storing hibernator from North America showing multiple single day bouts in the laboratory (Tamias striatus, Order: Rodentia, data from [94])