Animal physiology is the essential core text for all those studying physiology or zoology. The advances that have taken place in the field of physiology during the last four to five decades are spectacular. Providing an exhaustive pool of knowledge concerning the various phylums classes orders and families of animal kingdom animal science should prove to be an interesting guide into the world of animals. As physiology has considered vital significance in the present time and without the basic knowledge of anatomy and histology, a student can not understand biological importance and function of organ or system within the body. The book will prove immense helpful to the students of biology and other also.