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The animal kingdom is characterized by heterotrophic eukaryotic organisms that are multicellular and do not have cell walls in their cells. They are directly or indirectly dependent on plants for food.

They digest their food in the internal cavity and store the food reserves as glycogen or fat. Their mode of nutrition is holozoic - by ingestion of food.

They follow a definite growth pattern and develop into adults which have a definite shape and size.

Higher forms show an elaborate sensory and nerve-stimulating mechanism.

Most of them are capable of locomotion and sexual reproduction occurs after the copulation of the male and female followed by the development of the embryo.

Cellular Level of Organization	The cells are organized as free cell lumps. Such kind of cellular organization seen in sponges.	Sponges
Tissue Level of Organization	Animal cells shows the division of exercises amid themselves. Cells carrying out the same capacity are organized as tissues.	Coelenterates.
Organ Level of Organization	Group the animal tissues carrying out similar capacity into shape organs. Every organ is specific for particular capacity.	Platyhelminthes.
Organ framework Level of Organization	In animals where organs have related to shape functional frameworks where every framework is related to a particular physiological capacity, display organ framework level of organization.	Molluscs, Chordates and Annelids etc.

Classification of Animal Kingdom

The animal Kingdom is classified in following phylum :

Porifera,

Coelenterata,

Platyhelminthes,

Aschelminthes,

Annelida,

Arthropoda,

Mollusca,

Echinodermata,

Chordata