Question

Mammals from colder climates generally have shorter ears and limbs to minimise heat loss. This is stated by:

• A. Bergmann’s rule
• B. Allen’s rule
• C. Gloger’s rule
• D. Foster’s rule

Answer 1

The correct option is B Allen’s rule

Allen's rule states that, in endotherms that have distinct geographic populations, the limbs, ears and other appendages of the animals living in cold climates tend to be shorter than in animals of the same species living in warmer climates. Shorter and more compact body parts have less surface area than elongated ones and thus, radiate less body heat.

Therefore, mammals from colder climates generally have shorter ears and limbs to minimise heat loss.