Why is tigers bigger and lighter in the north?

Answer 1

Mammals tend to be larger in the northern regions of their range. This is known as "Bergmann's Rule". Examples: The Siberian tiger is the largest subspecies, averaging somewhat heavier than other subspecies, but Bengal tigers are nearly as big. Other examples are white tailed deer, which average larger in northern climes than down south, with the tiny Key Deer no bigger than a medium sized dog.There are exceptions, however. The largest black bear ever killed came from North Carolina, 880 pounds. Siberian tigers live in a cold snowy climate, and are somewhat lighter in color as not to stand out too much in snowy forests.