Hearing sounds from hidden creatures, Nestor the pig treks through his farm yard attempting to guess what kind of animal could make each noise. Through innovative Lift-a-Flap sound technology, kids can play along by pressing the button fixed to each page and listening to the sound it emanates. Then, they can guess what type of animal the sound might belong to and lift the flap to discover the answer. Behind reeds, hay, and fences are ducks, sheep, and horses. Nestor's journey ends when he hears a familiar squeal; when you lift the flap, his mother is revealed!