What do you need to be a animalia?

Answer 1

Animalia are multicellular eukaryotes, the simplest of which is now considered the sponge (porifera).

Answer 2

To be classified as Animalia, an organism needs to be multicellular, heterotrophic (obtain nutrients by consuming other organisms), lack cell walls, and have the ability to move at some stage of their life cycle. This kingdom includes a wide variety of organisms from insects to mammals.