The biological relationship between melanin levels and climate across mammals and birds, where populations living in warmer climates have darker skin, fur or feathers than do populations of the same species living in cooler areas, is called

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This relationship between melanin levels and climate across mammals and birds is specifically referred to as Gloger's rule. Allen's rule refers to the length of extremities in relation to climate, Bergmann's rule refers to body size in relation to climate, the bioclimatic law is a general term for the relationship between organisms and their environment, and Riesenfeld's rule is not a recognized biological concept.

The Biological Relationship Between Melanin Levels and Climate Across Mammals