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:
“It is an endless and frivolous Pursuit to act by any other Rule than the Care of satisfying our own Minds in what we do.”
—Richard Steele (1672–1729)