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 adventure/fantasy movie about cave people that was remade in color in 1966 with Raquel Welch as "One Million Years B.C." (There's also a colorized version of this one.) The setting is the prehistoric era when humans lived with dinosaurs. (That never happened, but don't let reality spoil the fantasy.) The dinosaurs are all played by normal-sized reptiles that are made to look enormous by special effects that were so good at the time that they were nominated for an Oscar.
The main characters are a cave man named Tumak (Victor Mature) and a cave woman named Loana (Carole Landis.) They live with different tribes that have opposing methods of cooperation and survival that are very similar to today's polarized society. Tumak's conservative rock tribe are bullies who think that only the rich and powerful should rule and prosper, and their success will trickle down to the others and Loana's liberal shell tribe thinks that everybody should be taken care of equally, leaving them all broke and and defenseless. (Don't throw me out of the tribe, I'm just joking.) Tumak is thrown out of his tribe and attacked by a woolly mammoth. Loana finds him and takes him to her tribe to rehabilitate him. When Tumak proves to be too violent for Loana's tribe, they kick him out and she follows him on a journey that ends at his tribe's cave.During their journey they encounter various giant reptiles played by several species of lizards (which you can see here) and other animals, including mammoths and giant horned armadillos.
When they are walking through a jungle, Tupak and Loana see a snake in a tree and before they can get past it, a giant mammal grabs the snake it its mouth, pulls it off the tree, then starts to eat it.
The snake is a California Kingsnake and the predator is a live Coatimundi. Both are made to look gigantic with special effects.
The coati must have been hungry, because it really does attack the snake and eats it. This is one of several examples of animal cruelty in the movie. In 1940 the American Humane Society became the official monitoring body for the humane treatment of animals in filmed media, but this movie was probably in production before they started.