Torpor in an Andean Hummingbird: Its Ecological Significance

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Science  08 Feb 1974:
Vol. 183, Issue 4124, pp. 545-547
DOI: 10.1126/science.183.4124.545


Field studies on an Andean hummingbird showed that nocturnal torpor occurs more frequently and lasts longer in the winter. Energy depletion does not seem to cause this yearly torpor cycle, and a photoperiodically controlled rhythm that enables the birds to automatically conserve energy in early evening for possible metabolic expenditures required later in the winter night is suggested.

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