This book is an outcome of research work carried out for four years in the Department of Zoology, Yogi Vemana University, Kadapa, Andhra Pradesh - India. The present research work encompasses five chapters. First chapter deals with the evolutionary backgrounds, seasonality, ecological relationships etc,. Second chapter corresponds with excellent review of literature. Third chapter covers detailed methodology, fourth chapter enlightened the results and discussion. Fifth chapter rules with complete bibliography. This book can be foundation for future endeavors to build upon these results for...