Although Allen's and Bergmann's rules most often explain body shape and morphology, we occasionally see variations from the correct patterns. This indicates that:

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The fact that we occasionally see variations from the correct patterns suggests that the association between body shape and morphology does respond to environmental stressors. This is consistent with the idea that natural selection is driving the evolution of these traits based on their adaptiveness in different environments. Acclimatization, developmental processes, and other factors may play a role as well, but they do not negate the importance of natural selection in shaping body shape and morphology.

Although Allen's and Bergmann's Rules Most Often Explain Body Shape