The book "Bio-mechanisms of Swimming and Flying" offers a comprehensive examination of the biomechanical principles that enable animals to swim and fly. It highlights the diverse mechanisms employed by various organisms to move efficiently in fluid media. Research in this field not only has biological relevance but also inspires engineers and scientists to develop innovative solutions. This updated edition includes 31 chapters that present the latest findings on natural autonomous systems and the locomotion of organisms in both water and air. A new section on sports science has been added, focusing on the analysis and simulation of human swimming behavior. The computer-based models and simulations discussed in this book are crucial for interdisciplinary collaboration between biology and engineering. Additionally, an innovative technology for the flight of microscopic aircraft based on the principles of insect flight is introduced.