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Bergmann's rule - WikipediaAllen's rule is an ecogeographical rule formulated by Joel Asaph Allen in 1877, broadly stating that animals adapted to cold climates have shorter limbs and body appendages than animals adapted to warm climates. More specifically, it states that the body volume-to-surface area ratio for homeothermic animals varies inversely with the average temperature of the habitat to which they are adapted (i.e. the ratio is high in cold climates and low in hot climates) due to thermal adaptation.
Bergmann's rule is an ecogeographical rule that states that within a broadly distributed taxonomic clade, populations and species of larger size are found in colder environments, and species of smaller size are found in warmer regions. Although originally formulated in terms of species within a genus, it has often been recast in terms of populations within a species.