A Bighorn sheep guards his butte. Castle Trail, Badlands National Park.

@cliffordbeshers I wouldn't want to be head-butted by that fella!

@odd @miraz He was, in fact, quite placid. He was joined by two others on the grass beyond that rock and they ignored us. This place is also an amazing grassland over old volcanic ash, so sod gives way to spectacular erosion like a storm erodes sand on a beach.