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This Concept Map, created with IHMC CmapTools, has information related to: Nocturnal Hypothermia in birds, Juniper Titmice for which nocturnal energy savings range from 10-28% (which are critical to their survival) (Table 1), Nocturnal energy savings ranged from 7%-50% (which are critical to their survival) (Table 1) suggesting that MCs are more "finely tuned" than JTs in their overall energy savings, H(s) = H(m) +/- H(cd) +/- H(cv) +/- H(r) - H(e) specifically modifying H(s) = body temperature, Summer is 9-10 hours reflecting the number of hours of darkness in each season, H(s) = H(m) +/- H(cd) +/- H(cv) +/- H(r) - H(e) specifically modifying H(m), smaller JTs lower their body temps more at night than larger JTs (therefore smaller individuals will conserve more energy) selected for because smaller JTs have less fat and can starve more easily than larger JTs, smaller JTs have less fat and can starve more easily than larger JTs suggesting JTs are more "fine tuned" than MCs to facultative nocturnal hypothermia, the extent to which the body temperature was lowered ("depth of hypothermia") was not correlated with the outside night temperature (Fig. 2), Duration of Hypothermia in the Winter is 14 hours, the extent to which the body temperature was lowered ("depth of hypothermia") was Positive correlation with the how cold it was at night (so colder air temp; lower body temp) (Fig. 2), Duration of Hypothermia in the Summer is 9-10 hours, Mountain Chickadees for which Nocturnal energy savings ranged from 7%-50% (which are critical to their survival) (Table 1), Facultative Nocturnal Hypothermia is used by Juniper Titmice, lowering the amount of calories it burns overnight ("save energy") potentially increasing the bird's overnight survival (birds can "starve" overnight if their energy needs exceed their fat reserves), the extent to which the body temperature was lowered ("depth of hypothermia") was inversely correlated with an individual bird's body mass (no Figure provided) (relatively small "n"), Mountain Chickadees with the following similar results for the 2 species (Fig. 1), the following similar results for the 2 species (Fig. 1) including Duration of Hypothermia, Facultative Nocturnal Hypothermia is defined as the ability of an individual bird to drop its body temperature (Hs) at night below its "normal daytime" body temperature, the following similar results for the 2 species (Fig. 1) including Winter and summer nocturnal temperatures did not differ, Winter and summer nocturnal temperatures did not differ because this study was conducted in the mountains of Utah where summer nighttime temperatures can be below freezing!