- Multicellularity-Animals are composed of multiple cells, unlike bacteria and other single-celled organisms.
- Heterotrophy- Animals obtain their organic compounds by consuming other living organisms either by eating them or by absorbing nutrients from them through skin or other body surfaces.
- Motility-Animals are capable of movement at some point in their lives, even if it is only as a sperm or larva.
- Reproduction-Animals usually reproduce sexually, and their offspring are typically cared for by the parents.
-Sensory and nervous system-Animals possess sensory organs and a nervous system that allow them to detect and respond to stimuli.
- Organization-Animals have specialized tissues, organs, and organ systems that perform specific functions.
The above characteristics are present in some species but may vary in others, which is why the classification of animals is complex.