Animal Classification

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Formation of groups and sub-groups of animals depending upon similarities and differences among animals is called animal classification.

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It makes the study of animals easier, helps identify animals accurately, gives an idea about evolution, and helps us understand habitat, adaptation, and the role of animals in nature.

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The estimated number of animal species on Earth is approximately 7 million.

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Aristotle was the first to perform animal classification. He used body size, habits, and habitats as criteria. His method is called the Artificial method.

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Theophrastus, Pliny, John Ray, and Linnaeus also followed the Artificial method of animal classification.

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It is based on body organization, types of cells, chromosomes, and biochemical properties.

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Dobzhansky and Meyer used the system of classification based on evolution.

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Carl Woese proposed the three-domain system of classification: Bacteria, Archaea, and Eukarya.