Within the same species of mammals,populations with less bulk are found nearer the equator while those with greater bulk are found farther from the equator.This is known as:

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Bergmann's rule states that within the same species of mammals, populations with less bulk are found nearer the equator while those with greater bulk are found farther from the equator. Allen's rule refers to the relationship between body shape and temperature, while Gloger's rule states that animal populations in hot and humid environments tend to have darker pigmentation than those in cooler and drier environments. Stein's rule is not a recognized scientific principle related to this topic.

Within the Same Species of Mammals,populations with Less Bulk Are