Berg·mann's rule (bûrgʹmənz) n.
The principle holding that in a warm-blooded, polytypic, wide-ranging animal species, the body size of the members of each geographic group varies with the average environmental temperature. According to this principle, warm-blooded animals living in cold climates tend to be larger than animals of the same species living in warm climates.
  [After Karl Bergmann (died 1865), German biologist.]

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Universalium. 2010.

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