Multicellular organisms excludes all animals.
Animals are multicellular , eukaryotic organisms of the kingdom Animalia ( also called Metazoa ) . Multicellular organism . All species of animals , land plants and most fungi are multicellular , as are many algae , whereas a few organisms are partially uni - and partially multicellular , like slime molds and social amoebae such as the genus Dictyostelium .