Amazon.com description: Product Description: Pig drives the train while his friend the Duck toots the whistle. As their train rolls along the tracks, they are greeted by two birds in a hedge, three cows grazing in a field, four sheep who cry out "Baa baa," and five large elephants. A big red button shows on the locomotive's front end and through the book's front cover, as well as through every one of the book's pages. When kids press the button they hear a friendly squeak. And when Mom or Dad reads the rhyming text, children receive their first introduction to counting. Here's a charming little picture storybook for nap time or play time. The durable board pages are rounded at their corners for safety.