The field of study that is concerned with animals is known as zoology. It is concerned with the investigation into individual animals and their constituent parts - animal populations, entire faunas and their relationships of animals with each other, with plants, and with the nonliving environment. Zoology encompasses all aspects of scientific knowledge about animals, such as embryonic development, evolution, behaviour, ecological distribution and classification. It is sub-divided into many branches like zoology, animal physiology, cognitive zoology and vertebrate zoology. Zoography focuses on the study of animals and their habitats while animal cognition deals with the mental abilities of non-human animals. This book presents the complex subject of zoology in the most comprehensible and easy to understand language. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included in it. This book aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline