Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
Joshua is a black soldier who returns from the war and becomes a bounty hunter to track down the men who killed his mother while he was away. In one scene, as he secretly watches a man in a dry wash below him, he hears a rattlesnake behind him. He draws his gun and points it at the snake, but instead of shooting it, he decides to catch the snake and drop it off the cliff onto the man below. The snake lands directly on the man and immediately bites him on the neck. The dies in about a minute as we see the snake nearby and eventually it crawls away into the brush. It seems to me it would have been a lot easier and safer if Joshua had just shot the guy, but if there's one thing I've learned from movies, it's that rattlesnakes are always cocked and ready to bite whoever they're thrown at. The snake is the common movie rattlesnake - a Western Diamond-backed Rattlesnake.