About the book (from Wikipedia):
Just So Stories for Little Children is a 1902 collection of origin stories by the British author Rudyard Kipling. Considered a classic of children’s literature, the book is among Kipling’s best known works.
Kipling began working on the book by telling the first three chapters as bedtime stories to his daughter Josephine. These had to be told “just so” (exactly in the words she was used to) or she would complain. The stories describe how one animal or another acquired its most distinctive features, such as how the leopard got his spots. For the book, Kipling illustrated the stories himself.