These threads are called cilia, and they are much smaller than flagella (the whip-like tails found on some other microorganisms). Cilia beat rhythmically, creating a current that propels the organism through the water.
Some examples of ciliates include:
* Paramecium: A single-celled organism commonly found in freshwater ponds.
* Stentor: A large, trumpet-shaped ciliate that is often found attached to aquatic plants.
* Vorticella: A stalked ciliate that is often found attached to other organisms or surfaces.
Cilia are also found on other organisms, such as the lining of the human respiratory tract, where they help to move mucus and debris.
