The proposed text fills an important void in the subject area of fluid mechanics. While there are advanced undergraduate texts in fluid mechanics which primarily focus on industrial application and lower-level texts which attempt to describe the fluids phenomena found in living systems, there is o text which connects the study of living systems and fluid mechanics at a level suitable for advanced undergraduate students or professional engineers. The proposed text fills this important void. Additionally, the connection between the study of fluid mechanics and climate change is an exciting extension of material introduced at the advanced undergraduate level. Fluid Mechanics in the Natural World bridges the gap between understanding classical fluid mechanics and the fluid mechanics phenomena that exist throughout our living planet. Of particular interest are fluid flows that can be found in living systems both in the atmosphere and in the Earth's oceans. The text examines a wide range of phenomena from the aerodynamics of migratory bird flight to the turbulence found in the human heart. Lastly the coupled fluids systems of the Earth's ecosystem--the atmosphere and oceans--shall be analyzed and described with particular attention paid to the way humans are impacting that ecosystem.