People tend to have arguments about the prey wolves choose, and here is a recent group of pictures taken at Yellowstone National Park, by Thomas Szajner Photography, that shows wolves don’t only go after the sick, the weak and the young.  They are notorious for being sport killers.  They love the thrill of the chase and the kill–even when they aren’t after food–as is shown when they leave many of their kills after killing.  Is it just me, or do these wolves appear to be smiling?

This mature, Yellowstone bull surely doesn’t look weak…or sick: