This is the justification based on the book ” The Expanding Circle: Ethics, Evolution, and Moral Progress.” I think the main point of the book is that many moral processes such as altruism in human are based on biological evolution from earlier social animals. That is also what I was trying to draw here. Peter Singer, author of The Expanding Circle, used wolves to make examples many times, like in page 8 of the paperback edition, to present the evolution of altruism and how it likely occurred in humans. That is why I kept the wolf head on the human.