Zoology is the branch of biology that relates to the animal kingdom, including the structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct
1. The branch of biology that deals with animals and animal life, including the study of the structure, physiology, development, and classification of animals.
2. The animal life of a particular area or period: the zoology of Alaska; the zoology of the Pleistocene.
3. The characteristics of a particular animal group or category: the zoology of mammals.
4. A book or scholarly work on zoology.