Vorticella protozoan feeding. Light microscopy footage in water of the feeding and coiling action of a Vorticella protozoan. This freshwater organism consists of a bell_shaped head and a stalk that here is anchored to a much larger filamentous green algae structure green, across top. The cilia tiny hair_like structures attached to the bell_like head are used to capture food and also for movement. The stalk contains a contractile fibril called a myoneme. This can contract, pulling the head back to the anchor point. This contraction occurs several times in this footage.