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

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Allen's and Bergmann's rules suggest that body shape and morphology are adaptations to environmental conditions, implying that variations can indeed be responses to different environmental stressors. This supports the idea that the association between body shape, morphology, and the environment is dynamic and can change in response to different pressures.

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