The textbook describes gastrointestinal tract of wild animals and birds and functions; nutrients and their needs; digestion of feed and nutrient digestibility, nutrient requirements and diet formulation for dogs and cats in six chapters. Wild animal nutrition as emerging discipline, nutritional classification of animals, evolving of nutritive requirements of wild animals and birds, feeding habits, planning for balanced feeding of zoo/wild animals, feeding of common birds and pet birds and feeding of sick animals-therapeutic diets are detailed in seven chapters. Through the textbook is termed as NUTRITION, the book contains detailed information in six chapters on control and conservation and taxonomy of wild animals and birds; effect of processing on nutritive value of foodstuffs; preparation, preservation and storage of foods; metabolic diseases in wild animals and birds and wildlife diseases. "Complete information in a comprehensive way" is the watchword of the book. The book is also useful to teachers and scientists of animal sciences, veterinary sciences and wildlife studies; zoo veterinarians, field veterinarians, personnel of zoological parks, pet and wild animal livers. This book is an added resource to all students of animal science and veterinary science for their preparation to face competitive examinations.