This is that old cave man movie in which Raquel Welch wears a fur bikini and gets carried away by a flying dinosaur.
The movie begins as if it's a nature documentary, with an announcer telling us "This is a story of long, long ago, when the world was just beginning" full of "Creatures who sit and wait." We see a vulture on a tree "Creatures who must kill to live." We see a large python on a tree. "And Man." We see a man hiding behind some branches. (It seems to me that men and women also sat and waited and had to kill to live, so this doesn't make much sense.)
Unfortunately, that's the only snake we see in the movie, but there are giant monster lizards and a scene with a giant sea turtle.