The gray wolf (Canis lupus) is one of the world's most well researched animals, with probably more books written about it than any other wildlife species. It has a long history of association with humans, having been despised and hunted in most agricultural communities due to its attacks on livestock, while conversely being respected by some Native American tribes. It is the sole ancestor of the dog, which was first domesticated in the Middle East. (Wikipedia)
A Gray Wolf in front of its den at the Red River Zoo in Fargo.