Two Grizzlies AND a Wolf

What are the chances of seeing two Grizzly Bears feeding on the carcass of a Bison AND having a Wolf try and inch its way closer and closer to get a taste for itself? Several Ravens joined in the fun, too. Unfortunately, all this took place the far side of a valley on a very distant hillside, so full zoom and very heavy cropping were needed. Really bad quality, but I just had to post it : ) Taken in Yellowstone National Park, Wyoming, US, on 13 September 2012 - I've always said that the number 13 is my lucky number!

"At the end of 2011, at least 98 wolves in 10 packs plus 2 loners occupied Yellowstone National Park. The population size (97 wolves) and number of breeding pairs (8) is the same as at the end of 2010."

www.nps.gov/yell/naturescience/wolves.htm