Why are wolves territorial?

They hunt live prey

Well, wolves are predators, just as much as any lion, puma, or crocadile. But if you are talking about someones tendancy to consider a wolf a vicious pest, it is sort of understandable. When you see wolves on TV, in movies, in Fairy Tales, a lot of the time you get to see their aggressive side; thus painting the picture of a downright mean animal. But even though wolves can look nasty, it is only nature's way of surviving. They are not out to kill people, or each other, they are only functioning the way they have for decades... so they can survive. But, wolves do often get in trouble for attacking sheep, goats, cattle, and the like. Now this is a real problem for the farmers. It is obvious that a wolf is not out to cause trouble; they think they are doing the smart thing by attacking the weakest animal. So now, wolves and people will sadly be enemies. I hope that in the future we can work out a way to keep wolves hunting their own food. Wolves are forced to kill livestock they have the right to do so, farmers have come into their territory.

So the answer to your question is, yes.