Animal biology or zoology is the scientific study of all structural, embryological, evolutionary and taxonomical aspects of animals. The study of animal behavior as well as distribution is also encompassed in this domain. Zoology has been divided into a number of sub-disciplines and related fields. Some of these are comparative anatomy, animal physiology, vertebrate zoology, invertebrate zoology, behavioral ecology, paleontology, etc. This book aims to serve as a resource guide in the fields of animal biology and diversity by presenting upcoming theories and concepts relevant to these fields. Different approaches, evaluations, methodologies and advanced studies in the area of zoology have been included herein. This book is a complete source of knowledge on the present status of this important field.