The fidelity of wolves

The wolves couple once in a lifetime, they are known by their loyalty until death to their partners, the wolf never deceives his wolf, and so too. When the wolves kill themselves in a place where they are imprisoned, their partners always come to the place where they have seen them for the last time, and they scream all the time, until the day they also kill or imprison themselves.

This shows the fidelity that lies between the wolves, so what is different from us humans ?? !!