Rulers of Yellowstone

While we were stopped at Old Faithful,
one of the trucks in the parking lot got mobbed by ravens.
The truck owners had left sacks of unprotected food,
and the ravens promptly got at them.
One enterprising raven hopped off with a bag of chex mix:

I was watching him (her?) and the raven knew very well that if she/he pecked the bag, it would open and the mix could be eaten.
And other ravens knew it too.
There was a bit of a showdown, in fact:

Ravens aren't the only animals that rule the roost at Yellowstone.
The bison stroll along the road and everyone makes way: