Saratov writer Nikolai Ivanovich Ledentsov wrote his first books while already in adulthood. In total, 17 books were published, as well as 70 fairy tales and short stories. Books by N. I. Ledentsov are a kind of encyclopedia that acquaints children with the world of animals. Here is the book "Swallow House." This is a small collection of stories about different birds. Reading the descriptions, it is easy to imagine each bird, their appearance and behavior are so accurately noted.