The present book on Zoology is specially published for the aspirants of IFS-Main Exam conducted by UPSC. The book comprises, along with the Latest Study Material, Previous Years’ Solved Papers to make you well-conversant with the exam pattern, the type of questions asked and their answers. Detailed Explanatory Answers have also been provided by Subject-Experts for the Selected Questions for Better Understanding.The main aim of the book is to present the vast subject of Zoology in a concise and reader-friendly manner so as to make you grasp the subject quickly and easily and to practise numerous questions on its various concepts and topics.The book is based on the Latest Pattern of exam, and will prove very useful for study, practice and during the precious moments before the exam for reference and revision. It is highly recommended to Sharpen your Problem Solving Skills with thorough practice of numerous questions provided in Previous Years’ Papers in the book, and prepare yourself to face the exam with Confidence, Successfully.While the specialised study and practice material of this book is aimed to professionally guide you for the exam, your own intelligence and practice in harmony with this will Ensure you a definite Success in your endeavour and a prestigious career with Indian Forest Service.