This was filmed along the Yellowstone River on August 21, 2011. At first, there was one grizzly on a bison carcass. Next, four wolves showed up to share the meat. Meanwhile, a sow and 2 cubs (not pictured) wandered towards the carcass, but then quickly turned around.

Footage includes:
Bison (Bison bison)
Gray wolves (Canis lupus)
Grizzly bear (Ursus arctos horribilis)
Ravens (Corvus corax)
Canadian Geese (Branta canadensis)
Common Merganser (Mergus merganser americanus)
Lodgepole Pine (Pinus contorta)

Music:
Edgar Meyer, Bela Fleck, Mike Marshall: "Big Country"

For some closer footage, look at Zack's footage:
youtube.com/watch?v=df4UB7Hm4-s&feature=share