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A Study of the Body Temperature of Birds


WITH regard to body temperature, animals are divided into two great groups, namely, warmblooded and cold blooded, the former including mammals and birds; the latter reptiles, amphibians, fishes, and all invertebrates. A more accurate distinction than the actual temperature, however, is based on the fact that the so-called warm-blooded animals have a constant temperature (homoiothermal) while the cold-blooded animals have a variable temperature which is practically the same as that of the environment in which they live (poikilothermal).

A Study of the Body Temperature of Birds.

By Alexander Wetmore. Smithsonian Miscellaneous Collections, Vol. 72, Number 12. (Washington, D.C., U.S.A.: Smithsonian Institution.)

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