What is the importance of "wolves" in the nonfiction book, Wintering?

In Section Four, the author draws a clear comparison between the constant, often violent hunger of wolves and the similarly constant, sometimes emotionally violent hungers of human beings. The latter sorts of hungers, as the author portrays them, are less about physical sustenance and more about psycho-emotional longings - for security, for comfort, and for faith that dark times will pass.