Subspecies
      Wolves are divided into subspecies because of appearance and geographical area. There is a reason why subspecies occur. In general, you can say that smaller bodied animals can withstand heat better and so they live in hotter climates. Conversely larger-bodied animals can withstand cold better, so they live in colder climates (northern climates). The same pattern is found in wolves with larger subspecies being found in Alaska and Siberia and smaller subspecies being found in India and Mexico. (Fuller 12)
      There are other factors influencing wolf size. Wolves' prey is generally hoofed animals from small deer to larger elk and bison. They sometimes hunt in groups to kill larger prey. Even though they use groups, wolf size is still a factor in the ability to take on prey. Larger wolves are generally found where prey is larger; smaller wolves are found where prey is smaller. (Fuller 15)
      Competition is another factor influencing wolf size. If a larger predator is found in the area, wolves may be smaller. So we see that subspecies are found in different areas because of the several factors contributing to wolf size. (Fuller 15)
      Another thing influencing subspecies is geographical barriers such as oceans, deserts, or mountain ranges. These barriers can prevent wolves from invading each others' territory and interbreeding. (Fuller 15)
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