Timber 
  Wolves are the wild dogs also known as Gray Wolves. The Timber Wolf lives in 
  Canada, Alaska, Pacific Northwest, north Midwest, and northern Europe and Russia. 
  They live in cold praries, forests, and mountains. The Timber Wolf is a very 
  powerful animal. They can be 6 and a half feet in length, and they have long, 
  sharp teeth. During the winter, many Timber Wolves will band together in a pack 
  (group of wolves) in order to hunt for food. They like to eat small animals 
  like rabbits, birds, reindeer and other animals. If they can't find any live 
  food, Timber Wolves will eat any dead animals they find. Sometimes they even 
  eat berries and nuts. When they aren't hunting, you might find Timber Wolves 
  in their dens. This is where they sleep and raise their young. The wolf den 
  could be a cave, hollow tree, or a hole in the ground that the wolf dug. A wolf 
  pack is usually made of one family of wolves, but during the winter wolf families 
  may join together to make one large pack. There is always one male that is the 
  leader of the pack. He is called the alpha male. His mate is called the 
  alpha female.
Although 
  many people believe that wolves are ferocious animals, there have been very 
  few reported attacks of wolves on humans. Usually if a wolf is confronted by 
  a person, he will run away. They are only violent when hunting their prey. Wolves 
  play an important role in keeping the population of small animals in control 
  throughout their habitat. Because of human expansion, there is a decreasing 
  number of Timber Wolves. This has caused an overpopulation of certain small 
  animals in places where Timber Wolves have disappeared. 

Click here or here to listen to the sound that Wolves make. It may take a few seconds to download.
Here are some cool facts about Timber Wolves: