Allen's rule is a biological rule posited by Joel Asaph Allen in 1877. It states that endotherms from colder climates usually have shorter limbs (or appendages) than the equivalent animals from warmer climates.
Read more about Allen's Rule: Theory, Mechanism, In Humans, Examples in The Animal Kingdom, Other Factors
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“My reason, it’s true, controls my feelings, but whatever its authority, it doesn’t rule them so much as tyrannize them.”
—Pierre Corneille (1606–1684)