Bergmann's rule

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Related to Bergman's rule: Jordan's rule, Gloger's rule

Berg·mann's rule

 (bûrg′mənz)
n.
The principle that in wide-ranging, warm-blooded animal species, individuals living in a cold climate tend to be larger than individuals of that same species living in a warm climate.

[After Carl Bergmann (1814-1865), German biologist.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
In biology, there is a general rule of thumb that animals tend to become smaller in warmer climates: an idea known as Bergman's Rule.
According to the biological principle known as Bergman's Rule, "warm-blooded animals living in cold climates tend to be larger than animals of the same species living in warm climates".