An Amoeba has no fixed shape. It pushes out pseudopodia ("false feet") to crawl and to surround food, engulfing it into a food vacuole. ▶ Play to watch it move.
Paramecium is covered in tiny beating cilia that row it through water and sweep food into an oral groove. A contractile vacuole pumps out excess water.
Euglena swims with a flagellum, senses light with an eyespot, and carries chloroplasts — so it photosynthesises like a plant yet can also take in food like an animal.