Heat regulation in some arctic and tropical mammals and birds.

@article{Scholander1950HeatRI,
  title={Heat regulation in some arctic and tropical mammals and birds.},
  author={P. F. Scholander and Raymond J. Hock and Vladimir. Walters and Fred Johnson and Laurence Irving},
  journal={The Biological bulletin},
  year={1950},
  volume={99 2},
  pages={
          237-58
        }
}
A series of arctic and tropical mammals and birds at Point Barrow, Alaska (lat. 71° N.) and in Panama (lat. 9° N.) was subjected to various air temperatures in a respiration chamber where the heat production was determined by oxygen consumption or carbon dioxide production. The larger arctic mammals and birds showed no increase in metabolism at — 30° C. and from observations on sleeping animals it is probable that their zone of thermoneutrality extends to — 40° C. or — 50° C. The smaller arctic… 

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