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Basically a worm is a brat and doesn't do what its parents tell it to like to eat its dirt or go to sleep. It just tells them no. Due to a lack of discipline in its life it then decides to go up to the surface which it has been forbidden to go. There it meets a hungry bird, a bird it didn't believe was real before it encountered one.
The worm doesn't learn to read in the story though. It does say lets learn some new words, then there's some pages with a word on each after the story.
Learn to Read the Naughty Worm been formatted to be read in portrait mode (holding your device vertically), where it takes up the entire screen. Words and pictures display together on the screen like a traditional picture book open to one page. A lot of self published Kindle authors can't be bothered to format their work and it displays like a mess with bits of text on one page and an image on a small part of the screen on another, so I always like to take the time to point out when authors care about their reader's experience and their own work enough to take the time to format it.