The Secret of Flight series includes 3 picture books about flying animals and aircrafts for kids of age 6-12. The first book is about flying insects, the second about birds, and the third about aircrafts. From little bugs to big airplanes, these books will let kids know more about nature, and understand how humans learn from nature to develop powerful technologies. The books are currently in production and more information will be released soon.
(The English translation is not final)