I watched 6 wolves kill a full grown moose in about 20 minutes. It was a blood curdling observation. I was bow hunting in northern Alberta, and it was 30 below. Those wolves were completely in their element. They killed with speed and presision. That day wolves grew on my respect list to the same stature as Grizzly/Brown bears. Black bears are not far behind them on my list either. I watched a boar black bear kill to black bear cubs one day ant it was a horific sceen to see those cubs torn apart.