What is allens rule in ecology?

Allen's rule is an ecological principle that states that endothermic animals (warm-blooded species) tend to have shorter extremities—such as limbs, ears, and tails—in colder climates compared to those in warmer regions. This adaptation helps to minimize heat loss in colder environments. Conversely, animals in warmer climates tend to have longer extremities to dissipate heat more effectively. Overall, Allen's rule highlights the relationship between an animal's morphology and its environment.