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
Famous quotes containing the word rule:
“This at least should be a rule through the letter-writing world: that no angry letter be posted till four-and-twenty hours will have elapsed since it was written.”
—Anthony Trollope (1815–1882)