Age range 3 to 6Knock 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' favourite 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.