The slime molds are very much like ameba protozoans. Modern classification systems usually exclude them from the kingdom Fungi, but traditionally they have been grouped with other fungi because of their similar outward appearance, their similar natural habitats, and because they usually form sporangia and many spores, unlike typical protozoa.

• Slime molds move like amebas. True fungi usually don’t move (except for the predatory worm-trapping type); they just grow into the host or dead stuff.
• Slime molds have no cell walls except around dormant spores or zygotes.
• Slime molds eat by engulfing their food by phagocytosis before digesting it within an intracellular vacuole which fuses with a lysosome. Most often they eat bacteria or yeasts or another fungus, which was busy digesting something else.