Birds Do It, Bees Do It (1974)

This is very interesting. It starts out with the sex lives of various animals. That’s about 70 minutes or so. Then the last 20 minutes are a chilling, truly perverse explanation of the ways humans have reorganized the reproduction of animals we eat so that we can better produce them in factories. It’s clever, and its point of view is archly sardonic. It doesn’t say that factories inseminating cows and surgically removing fertilized eggs from sedated heifers is horrible, but the film shows it, and the conclusions are easy to draw without saying anything.