Carolus Linnaeus classification of natural system is one of the earliest classification.His classification is known as the" Two Kingdom Classification".In this classification all the living organisms are placed under two categories.Here plants and animals are divided.
Plants are placed under "Kingdom Plantae" and animals are placed under "Kingdom Animalia".So Animalia is the name given to animal kingdom.Kingdom Animalia includes the animals such as protozoans, sponges, jelly fishes, worms, crabs, insects, spiders, snails, starfishes, sharks, bony fishes, frogs, lizards, birds and mammals.
Animal kingdom was initially divided into unicellular and multicellular. Protozoa is unicellular and metazoa is multicellular.Metazoa is further divided into vertebrates and invertebrates.
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