1. Theoretical necessity
(i) Gaining the identity of the living world: If you can get an idea about an animal of a group through taxonomy, you can get an idea about all the animals of that group. That is, taxonomy helps to know all the animals in a simple way.
(ii) Know about fauna: There are millions of species of animals in the world. Through taxonomy one learns about the fauna in less time and with less effort.
(iii) Identification of animals: Any branch of zoology requires accurate identification of animals for research, education, human welfare etc. Animals can be easily identified through taxonomy.
(iv) Knowledge of Animals: Our knowledge of animals can be summed up through taxonomy.
(v) Concise knowledge of animals: Taxonomy helps to summarize knowledge related to animals.
(vi) Identification of new species: Taxonomic knowledge is essential for identification of new species and their placement at various stages. New species cannot be identified without taxonomy.
(vii) Public recognition: Knowledge of taxonomy is essential in providing international public recognition of animals.
(viii) Determining the origin of animals: Modern taxonomy helps in determining the origin of animals and indicates the course of evolution.
(ix) Determination of ethnic relationship: The ethnic relationship of animals can be determined through taxonomy.
(x) International identification: Knowledge of taxonomy plays an important role in providing easy international identification of all the animals of the world.
(xi) Identification of herbivores: Identification of herbivores requires knowledge of taxonomy.
(xii) Development of improved breeds: Improved and disease resistant breeds of animals and plants are developed through artificial breeding. In this case knowledge of taxonomy is a must.
(xiii) Conservation of wild animals: Knowledge of taxonomy is necessary for control and conservation of wild animals.
(xiv) Selection of economic animals: Economic animals can be selected through classification.
(xv) Artificial Breeding: Genetic characteristics are taken into account in the classification of organisms. Knowledge of taxonomy facilitates creation of new and improved breeds of animals and birds through artificial breeding.
(xvi) Agricultural Development: Knowledge of taxonomy is essential for agricultural education, animal health improvement, pest control and crop improvement.
(xvii) Animal Husbandry: Taxonomy is required for rearing and care of poultry and cattle.
(xviii) Food chain: By means of taxonomy one can get an idea about the extinction of animals. Therefore, classification of animals is necessary to preserve animals and maintain the food chain. (xix) Position of animals: Classification is necessary to know the position of any animal in the animal kingdom.
(xx) Identification of Extinct Animals: Animals that have become extinct in the past are found as fossils. Their correct identification can be obtained by observing fossils and classifying them.
(xxi) Conservation of environment: Selection of plants suitable for the environment of any region can be done using the knowledge of taxonomy.
(xxii) Concept of Evolution: Through taxonomy, an idea of the course of evolution of organisms is obtained.
(xxiii) Development of new branches of science: Knowledge of taxonomy is essential for development of new branches of science especially biotechnology, biogeography, biomaterials etc.
2. Applied necessity
(i) Conservation of wild animals: Knowledge of taxonomy is necessary for control and conservation of wild animals.
(ii) Artificial Breeding: Genetic characteristics are taken into account in the classification of organisms. Knowledge of taxonomy facilitates creation of new and improved breeds of animals and birds through artificial breeding.
(iii) Agricultural Development: Knowledge of taxonomy is essential for agricultural education, animal health promotion, pest control and crop development.
(iv) Animal Husbandry: Taxonomy is required for rearing and care of poultry and cattle.
(v) Utilization of animals: By knowing the behavior and nature of animals and classifying them, the beneficial and harmful roles of animals can be known and they can be used accordingly.
(vi) Food chain: Taxonomy can provide an advance understanding of animal extinction. So animal taxonomy is necessary to maintain animal conservation and food chain.
(vii) Sorting of animals: Through classification it is known which are beneficial and which are harmful.