why animals living in cold climate are usually bigger than animals living in hotter climates?

Dear student, 
​Please find below the solution to the asked query        

Animals living in cold climate are usually bigger than animals living in hotter climates. This is because large body size help them to radiate less heat from the body (as surface area to volume ratio is low). Hence, they can stay warmer in cold temperatures.​
This rule is known as Bergmann's rule.
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