Animals

Animals are a monophyletic group of multicellular eukaryotes. The members of this group are typically motile and heterotrophic. However, many animals become sessile for large portions of their life cycle and several species have developed commensal and even mutalistic relationships with autotrophs. Examples of animals with sessile periods in their lives are sponges, jellyfish, barnacles, corals, hydra, and some species of bivalve mollusc. Examples of animals with close beneficial relationships with autotrophs are corals, acacia ants, and humans.