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A terrific set, Tim.
I agree that Yellowstone is a special place.
A small info nit: I'm pretty sure (but not 100% positive) that isn't mud on the bison. They have dust wallows that they roll around in. All the wallows I've seen were a white dust. Made from exactly what mineral, I'm not sure, but I've seen the big bruisers dust themselves all over, and when they're done, they look just like in your image. It's my favorite shot- in any case.