Paramecia are tiny near-animals that feed on algae, yeast, and bacteria. Journey to the Microcosmos put its new microscope to good use making a short film about one of paramecia's foes, a bacteria called Holospora, which infect paramecia and make their way to its nuclei.

https://boingboing.net/2020/08/31/gorgeous-video-of-paramecia-in.html