Physiological thermal regulation in poikilotherms

Because poikilotherms lack the physiological means to generate heat, the body temperature of these animals tends to conform to that of the outside environment in the absence of any behavioral intervention. Examples of poikilotherms include the "cold-blooded" animals (Kearney et al. 2009), such as most fish, amphibians, and reptiles. On the other hand, homeotherms have specific physiological adaptations for regulating their body temperatures; body temperatures of homeotherms do not fluctuate as much as those of poikilotherms. Indeed, all homeotherms maintain high body temperatures in the range of 36 to 42oC (Ivanov 2006) and include the "warm-blooded" animals, such as birds and mammals.

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