A 19th-century ‘rule’ connecting animal body size and environmental temperature has been challenged, allaying fears that animals may decrease in size as the climate gets warmer

Do animals get bigger as the climate they live in gets colder? According to a rule established in 1847, they do – which has had biologists concerned over what climate change might do to animal body size. But now an analysis of the weights and geographical locations of nearly 274,000 individuals from 952 bird and mammal species has challenged the idea.

Bergmann’s rule, formulated in 1847 by German anatomist Carl Bergmann, states that an animal’s body size is negatively related to the temperature of its environment: smaller individuals of a species are found in hotter regions of the species’ range, while larger members reside in colder climes. Moose, for example, are supposed to get larger further north in their range.

The rule, which most often refers to populations within a species but has also been applied to differences between species within a genus, has been invoked to explain

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