(i) In all there are seven million different species of animals on the earth.
(ii) These animals show lot of diversity in their habitat, structure, features etc.
(iii) Due to large number and diversity, they cannot be studied together.
(iv) Classification is a systematic grouping of animals considering their similarities and differences.
(v) Due to classification, the study of animals become systematic as well as convenient.
(vi) Classification helps us in advanced studies, research as well as evolution of animals.
(vii) By studying less animals, we come to know more about their groups and sub-groups.
(viii) Hence, it is very much necessary to classify animals in the most scientific way.