My 4 year olds learned about butterflies in school this year. They have been obsessed with the little insects for about 9 months now. This butterfly habitat is great for them to see the life cycle up close, with all the instructions on how to keep them alive! We have bought this for several birthday gifts for friends and family as well. It is always a big hit. I like that you choose when to get the caterpillars, so that if you have a vacation planned, the little guys aren't frying in your mailbox waiting for your return. The instructions are easy to follow and they guarantee that at least a portion of the creatures will form a chrysalis and emerge as butterflies. Every one we have purchased has been successful for all 5, so far, so I have not had to contact the company if there is a failure.