The Gay Anties(1947)

The 1890s; a picnic in the park. A man is pitching woo to his girl, while behind them a steady stream of ants is methodically devouring and carting off their food. Some other interludes include four ants eating Russian rye bread, then breaking for a Russian dance; a torch singer that sends everyone scurrying for some kind of ear plugs; a chef ant that coordinates the creation of three sandwiches that the humans eat.