The model demonstrates a mode of locomotion of representatives of some groups of protozoa and invertebrates. The appropriate groups may be selected by the "Infusorium", "Euglena" (Euglena green), "Tubemaker" (earthworm), "Insect" (cockroach) buttons. The first two animals are shown in aqueous medium, the images are essentially magnified. The animation is initiated by the "Start" button. When viewing an insect motion pay attention how it raises and lowers its feet in turn. The "Stop" button interrupts the model, while "Reset" button returns it into initial state.