Bergmann’s rule

An ecogeographic principle established by Bergmann (1847). It states that, within a broadly distributed genus, species of larger size are found in colder environments, and species of smaller size are found in warmer regions. The causation is seen in the adapted heat balance of animals. Although the rule fits to numerous species (e.g. wolves, foxes, deer, eagle owl) there are also a lot of exceptions.

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