Territory: They are some of the only animals up that high, and they spend their day hunting and walking around in their herds or by themselves (in the males case) They do not mark their territory, but while the females are giving birth, they claim an area for that time.
Mountain goats "migrate" in the winter months. They don't move very far. Usually they move lower to get to warmer temperatures. After the winter, the goats move back to where they were before.
Communication: The one way mountain goats communicate is by bleating. This helps the males during mating season. It is also used when females are hunting.