In the United States there has never been a documented case where a healthy wild wolf attacked a human, in fact it is very rare when a wolf even comes near a human.
Wolves travel in packs which can be as small as two wolves, or be as big as twenty wolves.
Adult wolves have the ability to regulate their body temperatures to adapt to changes in the weather. The puppies can not, so they must stay close to the warmth of their mothers. Wolves howl to communicate with each other. They know each members howls and use them to locate each other, and they seem to just really enjoy howling. Although there has been a very small few that have lived to be 13 years old or even longer.