Perhaps the most important aspect of modelling Artificial Life for computer animation is the accurate portrayal of motion. We introduce a method for the modelling and locomotion of Artificial Life based on the behaviour of single-celled organisms. We describe the means by which protozoa are able to move through fluids using flagella and cilia, and discuss a physically-based model for locomotion in this manner. We then apply this model to the locomotion of evolved artificial organisms.