I read this to a group of fourth graders, and that seemed to be the right audience age level. The book deals with the repercussions of an oil spill, particularly for animals, as well as bringing in volunteers from a wide variety of backgrounds who help them. At least one animal does not make it here, which is why I would say this would be a bit too intense for, say, first grade. The illustrations are really beautifully done, though, and the overall messages of protecting the environment and the importance of co-operation were handled very well.