Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is an old-fashioned low-budget caveman adventure movie made by Korean filmmakers but with no dialogue so there are no subtitles. The lack of words makes it hard to know when some scenes are supposed to be funny, but the fart jokes are obvious. It's set in a prehistoric world where humans live with lots of large dangerous animals, including dinosaurs, which they make human sacrifices to and also keep as pets. They also need to watch out for the tribes of cannibals. Much of the action involves tribes of cave people trying not to get eaten by giant animals, or people fighting each other and hunting for food. The dinosaurs and other large animals are all practical effects made with puppets and people in rubber suits. But there is a scene with a live snake.
The snake shows up when we see a tribe in the forest foraging for food. One of the cavemen climbs a tree to collect some large tree fruit. He throws fruit down to the others, then he spots a nest full of eggs. He reaches into the nest and pulls out a couple of eggs then eats them. As he does this, we see shots of a snake higher up in the tree, then climbing down towards him. The man is so busy eating eggs he doesn't see the snake until it strikes him. He falls down dead and the rest of his tribe runs away fearing for their lives.
The snake we see is a live non-venomous Burmese Python, but the species doesn't really matter here because, like most movie snakes, we're supposed to assume its bite is deadly. I think we're supposed to believe that the eggs belong to the snake and that the snake attacked the caveman for stealing them, but there is no way a snake could build a nest in a tree, so they could also be birds eggs. The scene works either way.
You can watch the whole movie and read a synopsis of it at TheSilverScream.com. The snake scene begins at about 32 minutes 49 seconds.