Stack the Cats is a charming book about counting & organizing cats in various formations. But when the cats decide to go their own way-as cats often will-it`s time to count down until there`s only one proud cat & bird left. Counting forward & backward, understanding when there is more or less of something, & grouping & recognizing items are key early math skills for toddlers, making these books as developmentally sound as they are visually engaging.