Travel across Earth to discover eight species that are blue in color and are either naturally rare, threatened, or endangered. Panoramic illustrations and a playful main text prompt a search for the blue species at hand, while the page-turn and informative sidebars zoom in to reveal a closer look at the species. There's a lot to uncover about the Karner blue butterfly, blue black bear, blue whale, Quitobacquito pupfish, Cerulean warbler, blue lobster, Eastern Indigo snake, and big bluestem grass. A surprise ending celebrates that planet Earth is the rarest and bluest and must be protected for the sake of all.