The present book entitled "Ecology and Environment" comprises 36 chapters by well known experts and research workers in their respective fields. This book contains 36 chapters pertaining to 5 in general Zoology. 7 in Entomology, 5 in Ecology and Environmental Biology, 5 in Aquatic Biology, 6 in Toxicology and Physiology and 7 in Experimental Zoology. We are thankful to all contributors who responded promptly by making available their articles and it overwhelming response which has catalytic impact upon us, to complete the task of publishing this book.