Dr. Dolittle's Garden by Hugh Lofting
Doctor Dolittle's garden is teeming with insects. So the Doctor decides to learn the insect languages and soon hears lots of fascinating stories. None is more fascinating than the tale of the giant moths, and the doctor starts to plan a trip to seek them out. But before he can set off, he is amazed by the arrival of one of these moths. What is the reason for the moth's visit?