* Multicellular: Animals are complex organisms made up of many cells.

* Nucleated cells: Animal cells have a nucleus, which contains their genetic material (DNA).

* No rigid cell wall: Unlike plants and fungi, animal cells lack a rigid cell wall, giving them flexibility and allowing for movement.

* Motile: Most animals can move independently, either by walking, swimming, flying, or using other forms of locomotion.

* Heterotrophic: Animals cannot produce their own food. They obtain nutrients by consuming other organisms (plants, animals, or decomposing matter).

* Internal digestion: Animals have specialized digestive systems where food is broken down internally, within a chamber or series of chambers.

Let me know if you'd like to know more about any specific aspect of animals!