Knock knock! Who lives here? Young children will love pulling up the sliders to see who's behind the doors of these adorable mini houses! They get to go inside, explore the owners' favorite rooms and learn what they do for a living. The appealing house-shaped books introduce readers to early numbers, professions and animals while exercising little fingers and thumbs to make flowers speak, monkeys skate and hippos take a shower. - An interesting, hands-on way to introduce young children to numbers, professions and animals. - The simple text is complemented by vivid illustrations, easy-to-use sliding mechanisms and friendly characters. - Multiple sliders display the animals all doing different activities in their houses. - An irresistible activity book promoting key fine motor skills and hand-eye coordination.