This book touches upon all major areas in the field of ecology and covers a wide range of topics. Beginning with classical mathematical models for population dynamics and their use in population management and harvesting, it covers the traditional as well as the most recent nonstandard methods of abundance estimation. The recent interest in the study of biodiversity is discussed at length. The last chapter on models for animal and plant behaviour is perhaps the first attempt to put the two together. Many exercises, theoretical as well as data analytical, which reflect authors' interaction with practicing field ecologists, make the book very useful for class room teaching and private study. Audience: This volume is intended as a text book for a one semester course for advanced undergraduate and graduate classes in statistics, mathematics of biology, or quantitative ecology