The Kingdom Animalia is a division of life that includes all the organisms that are classified as animals. They tend to have a multi-cellular structure. They consume other organic tissue to feed themselves. They are responsive to outside stimulus. They are motile during some stage of life. Unlike plants, they do not have a cell wall.
The Animal Kingdom has the largest number of organisms yet recorded. It includes sponges, worms, insects, birds, mammals, crustaceans, as well as humans.