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File:Basking turtles.JPG

Pseudemys turtles (shown here basking for warmth) are ectothermic.

Ectothermic (sometimes confusingly known as "cold-blooded") refers to organisms that control body temperature through external means. As a result, organisms are dependent on environmental heat sources[1] and have relatively low metabolic rates.[2] For example, many reptiles regulate their body temperature by basking in the sun. Many ectotherms are more specifically poikilothermic.[2]

See also


  1. Jay M. Savage ; with photographs by Michael Fogden and Patricia Fogden. (2005). The amphibians and reptiles of Costa Rica : a herpetofauna between two continents, between two seas, Chicago, Ill.: University of Chicago Press.
  2. 2.0 2.1 Milton Hildebrand; G. E. Goslow, Jr. Pprincipal ill. Viola Hildebrand. (2001). Analysis of vertebrate structure, New York: Wiley.