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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Trends Endocrinol Metab. 2009 Oct 26;20(10):490–498. doi: 10.1016/j.tem.2009.09.005

Figure 2.

Figure 2

Mammalian groups that display torpor. Torpor is widespread among mammals, suggesting that the relevant metabolic pathways and physiological processes are ancestrally derived. The dendrogram shows the phylogenetic relationships of families (each leaf of the dendrogram) within eight mammalian groups in which some members exhibit torpor. The type(s) of torpor exhibited by a specific family is indicated by color on the leaves of the dendrogram (see figure key). Representative animals that exhibit a form of torpor are depicted for each group except the Xenarthra (anteaters and armadillos). Groups of land-dwelling mammals for which torpor has not been described in any member are excluded from the dendrogram. Excluded groups include the superorder Cetartiodactyla (cattle, camels, and deer) and the orders Proboscidae (elephants), Dermoptera (flying lemurs), Lagomorpha (hares and rabbits), Scandentia (tree shrews), Perissodactyla (horses and rhinoceroses), and Pholidota (pangolins). The dendrogram was prepared using the interactive tree of life (iTOL) [103].