Animal Forest

Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and are multicellular^[4] (although see Myxozoa), which separates them from bacteria and most protists. They are heterotrophic,^[5] generally digesting food in an internal chamber, which separates them from plants and algae.^[6] They are also distinguished from plants, algae, and fungi by lacking rigid cell walls.^[7] All animals are motile,^[8] if only at certain life stages. In most animals, embryos pass through a blastula stage, which is a characteristic exclusive to animals.