If you have any interest in wolves, and let's face it, who doesn't? You should make it a point to watch Nature's In The Valley Of The Wolves on PBS.
One of the most fascinating sequences, at least for me, was when a new pack of wolves took over the valley and began to let the other animals there know that there was a new boss in town. The first victim was a male coyote who had the temerity to try to snack at one of the wolf pack's carcass'. The old wolf pack would have just chased him off, the new wolf pack chased him down and ripped him to pieces. Don't let anyone tell you that war is a man made invention, this was the purest act of war I have ever seen. Von Clausewitz would have been proud.