The ear size of goats living in cold regions is smaller than that goats living in warm regions. Explain the advantage of having smaller ear size in cold regions?

The main advantage of having small size ear in cold reason is to protect the body heat to fell warm in cold surroundings.

Explanation:

The ear size is directly related to the heat exchange rate of our body. Greater the ear size, greater will be the surface area to dissipate the body heat. So, the goats living in warm areas have big size ear, so that they can release more body heat to surrounding to stay cool. In the same way in cold areas, goats have to conserve the body heat so they tend to have small sized ear.