Motile bacteria are characterized by propeller-like structures called flagella. These structures vary in distribution but allow equipped bacteria to move quickly — albeit via a convoluted path — through aqueous, sometimes even highly viscous, environments. The flagella stain is the only stain that we will not perform in lab; however, please take time to observe this stain in the demo microscope at the back of the room and draw this stain in the results section following this experiment.