Allen's rule

Allen's rule, an ecogeographical rule, states that significant differences exist in the size of limbs and

other external organs of animals, even within the same species, depending on the geographical region in

which they live.

 Animals living in colder regions of the world, for instance, have shorter limbs than those living in warmer regions as an adaptation to control the dissipation of heat. A smaller body surface area helps animals in colder regions stay warm by slowing down the loss of body heat.

#ENVIRONMENT