ves, larger in body it will be. This is true because in the colder climates away from the equator, an animal needs a larger body with less relative surface area to help it stay warm in winter. Controversy, a smaller animal with a relatively larger surface area can dissipate body heat easier, helping them remain cool. Allens rule is a rule, which states that among endotherms, populations of the same species living near the equator tend to have more protruding body parts and longer limbs than do populations farther away from the equator. Two examples of the Bergmann rule are House Sparrows and massive polar bear bodies. House Sparrows were introduced to North America in the late 19th century. Northerly animals are larger than the more southerly animals. This is consistent with Bergmanns rule, which states the members of the same species in colder climates at higher latitudes will be larger. Polar bears have immense size with relatively small surface area from which they can lose their internally produced heat. This is an important asset in cold climates in addition, they have heavy fur and fat insulation that help retain body heat. The two that demonstrate Allans rule are slender East Africans and Inuit man. This phenomenon can be observed among humans. The East African Masai men shown here are normally tall and have slender bodies with long limbs that assist in the loss of body. This is an optimal body shape in the hot tropical at a disadvantage in arctic regions. In such extremely cold environments, a stocky body with short appendages would be more efficient at maintaining body heat because it would have relatively less surface area compared to body mass.Bergmanns rule and Allans rule both are complementary to each other yet still being completely different rules. They have the same meaning and principles behind them. They show that things that are looked at as different can some times add and make each other more complete. Through ther...
