An owl fights a snake (and it's a close fight): from "The Chain of Life", the last episode of landmark environmental tv series Our Vanishing Wilderness, from 1970. Produced by Shoshoni Productions for National Educational Television. Narrator: John Hamlet.
See thirteen.org/ourvanishingwilderness for all 8 episodes in the series. OVW was the first environmental TV series produced in the US. It was shot in 1969, and aired nationally in 1970.