Ontogeny and phylogeny of endothermy and torpor in mammals and birds.

@article{Geiser2008OntogenyAP,
  title={Ontogeny and phylogeny of endothermy and torpor in mammals and birds.},
  author={Fritz Geiser},
  journal={Comparative biochemistry and physiology. Part A, Molecular & integrative physiology},
  year={2008},
  volume={150 2},
  pages={176-80}
}
Endothermic thermoregulation in small, altricial mammals and birds develops at about one third to half of adult size. The small size and consequently high heat loss in these young should result in more pronounced energetic challenges than in adults. Thus, employing torpor (a controlled reduction of metabolic rate and body temperature) during development would allow them to save energy. Although torpor during development in endotherms is likely to occur in many species, it has been documented in… CONTINUE READING
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