This book investigates the diverse adaptations of animal locomotion across different environments. Henry B. Kane, an established nature writer and illustrator, draws upon extensive field observation and biological research to explore how creatures have evolved unique methods for movement. The work presents a comparative study of how animals utilize wings for aerial navigation, legs for terrestrial travel, and fins for aquatic propulsion, highlighting the evolutionary pressures that shaped these distinct forms.

This work is recognized for its detailed illustrations and clear explanations of animal anatomy and locomotion. It is often cited as a valuable resource for understanding the biological principles behind how animals move. The book's approach is generally considered informative and accessible to a broad audience interested in natural history.