There is a unique harmony that reigns in the pack of wolves. With his yell the wolf makes a "social call" to indicate his position so that the other members hear him and give them back. But it is also to warn that the area is already occupied by a pack if other groups tried to approach their area. When we talk about wolves, we often refer to the gray wolf, which is the best known and the most widespread in the world. Since 1990, wolves have been classified as protected species.