Bergmann's rule

Bergmann's rule is an ecological principle that states that within a species, individuals in colder environments tend to be larger in body size compared to those in warmer environments. The rationale behind this rule is based on surface area-to-volume ratios: larger animals have a lower surface area relative to their volume, which helps reduce heat loss in colder climates. Conversely, smaller animals have a higher surface area relative to their volume, facilitating heat dissipation in warmer environments.