This book series is great! The flaps are fantastic for toddlers--they'd really need to work to rip them off. It's not impossible to do so (if you have a little one who really has made it a mission to destroy flap books maybe hold off a bit longer) but it's definitely sturdy enough to hold up to just general flap pulling enthusiasm. The illustrations, choice of animals and little text factoids are great. The book recommends itself for ages 2+ but we found it to be a winner from around 18+ months.