This one is from today, was pretty stoked to see it, after being pretty spooked to see it. Seen on the Petrified Forest Loop trail at Teddy Roosevelt NP. Was watching a bird that had taken iff and the next thing I knew it was giving me the heads up.

Another shot of the Prairie Rattlesnake still raised up but calming down.

Got a little to the side of the Rattlesnake as it calmed even more but remained partially raised up.

Another shot of the Prarie Rattlesnake moving along the trail. shortly thereafter it went to setup just off the trail and I moved along well off trail on the other side.

Couple videos on the Bluesky post of it slithering away along the trail.