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 words allen and/or rule:
“The answer, my friend, is blowin’ in the wind,
The answer is blowin’ in the wind.”
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“When I came of age I did not know much. Still somehow, I could read, write, and cipher to the Rule of Three.... The little advance I now have upon this store of education, I have picked up from time to time under the pressure of necessity.”
—Abraham Lincoln (1809–1865)