Origin of Bergmann's rule
"Bergmann\'s rule." YourDictionary, n.d. Web. 15 September 2018. <http://www.yourdictionary.com/bergmann-s-rule>.
Bergmann\'s rule. (n.d.). Retrieved September 15th, 2018, from http://www.yourdictionary.com/bergmann-s-rule
Named after Carl Bergmann, nineteenth-century German biologist.
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