【About the Author】 Eric Carle is widely known as an author of children's picture books. His works are characterized by a colorful and visually appealing style. 【Book Contents】 This set includes 4 books, such as "The Very Busy Spider" and "The Very Lonely Firefly." Each book teaches children about nature and the process of growth. 【Features】 This picture book set is perfect for toddlers and young children, suitable for reading aloud and self-study. The colorful illustrations and simple stories capture children's interest. - Author: Eric Carle - The Very quiet criket - The Very Busy Spider - The Very Lonely Firefly - mixed-up cameleon Thank you for viewing. The Very Lonely Firefly used to light up with batteries. The Very quiet criket also had a battery-powered sound mechanism. Both are currently not working due to dead batteries. Whether they will work with battery replacement has not been checked. They are hardcover books.