Paramecium feeding. Light microscope footage of numerous ciliate protozoans including Paramecium species (the larger cells), swimming and foraging in pond water. Ciliate protozoa are tiny single-celled aquatic organisms which move by the rhythmic beating of many hair-like cilia. They mostly feed on smaller organisms such as algae and bacteria. Paramecium and many other ciliates are abundant in water and soil. Filmed with brightfield illumination.