A Common AncestorCredit: John and Karen Hollingsworth | US Fish & Wildlife Service

The wolf, an ancestor of the domestic dog, is both a cherished and feared creature. There are many different subspecies of wolves, and in the U.S., the gray wolf, red wolf, Mexican wolf and Arctic wolf are all endangered

to see all 12 images in the gallery, go to:  http://www.livescience.com/15159-wolves-gallery.html .