This textbook provides a clear introduction to the fundamentals, methods, and phenomena of bioliquid mechanics without mathematical derivations. It covers the flying and swimming of animals as well as blood circulation in the human body. The primary focus is on how to leverage nature's evolution for new technological innovations. Development engineers find new ideas from natural evolution for their product development, scientists can engage with evolutionary theory, and medical professionals can expand their understanding of the circulatory system by incorporating the bioliquid mechanical component into the planning of heart surgeries.