Zoology is the branch of biology that deals with the animal kingdom. It's the scientific study of everything having to do with animals, same as botany is the scientific study of plants. Zoology is a briefly explained field which covers the classification, kingdom of every animal on earth as well as many broader field information and inquiry related to animal life and their behavior.
The term zoology was fairly simple back in the 4th Century BC, when the ancient Greek philosopher, Aristotle, proposed some of the first broad of classifications of living beings. He was logically divided and categorized all living beings into animals.
Topics cover in Zoology: An Introduction are Biodiversity, Taxonomy, Classification of Animals I, Classification of Animals II, Animal Tissues, Nutrition and Food in Animals, Respiration System in Animals, Animal Circulatory System, Excretion and Osmoregulation, Movement and Locomotion, Nervous System and Reproduction in Animals.