Animals that live in cold climates, have a large body size compared to living in warm

Most vertebrate species living beings body weight increases as their "proximity" to the poles. For example, the average weight adult male white-tailed deer, Florida, USA, is approximately 57 kg, whereas mature males of the same species in a northern Montana weigh 114-125 kg on average.

The rule, which states that the larger animals live in colder climates, it was formulated in the 19th century and became known as Bergmann's rule after its author. There are several factors that can affect the size and body weight of the animal: large quantities of food, sex selection in favor of the larger males and clashes with competitors can lead to the fact that the body becomes larger.

While Bergmann's rule explains how animals cope with the issues of regulation of heat loss and heat in cold conditions, there are other reasons why the animals krupneyut cold. "How do you size, the more fat accumulated in your body so you can comfortably spend the winter" - explain biologists.

via factroom.ru