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Bergmann's rule is an ecogeographical principle that explains the relationship between body size and environmental temperature in endothermic (warm-blooded) animals, including humans. Proposed by German biologist Carl Bergmann in the 19th century, the rule states that within a broadly distributed taxonomic group, individuals in colder climates tend to have larger body sizes than those in warmer climates. Larger bodies have a _______ ________ _________ ________ _______ __________ ____ _______ _______ _______.
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