what is the question?

Buck nightly hears an ancient call deep in the forest. Sometimes he searches for it. Sometimes he hears it, springs from his place and runs wild through the forest. One night he hears it more clearly than ever before. He goes into the forest and he sees a timber wolf. Wishing to make friends, Buck approaches; but the wolf is afraid of this beast three times his size, and he flees. Several times this meeting is repeated, until finally the wolf understands Buck's intentions, and they sniff noses. The wolf motions for Buck to come with him, and Buck is wildly happy as they run. He now understands what the call meant, running wild and free with his brothers.