From an infusion of flowers, leaves and grass (prepared several days before), I extracted a drop of water and placed it on a slide. In this drop I discovered an entire universe of microorganisms, including the one from the image above – the famous Paramecium (protozoa from the Kingdom Protista). This unicellular infusorian ciliate has an oval-elongate shape and lives in stagnant freshwater. Its membrane presents vibrating cilia which contribute to its locomotion in the aquatic environment.