Allen's rule
Revision as of 04:28, 7 February 2010 by imported>Meg Taylor (spelling: enviroments -> environments)

Allen's rule is an observed pattern of morphological traits that vary within a species based on their geographical location proposed by Joel Asaph Allen. Specfically, Allen's rule states that members of warm-blooded species that live in hot environments have longer extremities in comparison with members of the equivalent species living in cooler environments.