Erik or the Small Book of Insects.

Erik is a Dutch ten year-old schoolboy who is studying insects at school, and gets shown and explained a bit about them by his kind and knowledgeable nature-loving grandfather, whose country estate is a good place to do so and turns out to have a book on insects, which allows Erik to pass for one night, rather like Alice in Wonderland, as a miniature man among thus giant-looking, talking insects, who discuss their and other species and their lives with him, mainly winged ones, such as bee, fly and wasp.