This special edition comes with a free poster (the reverse side of the dust jacket) celebrating National Geographic's Photo Ark Initiative, now in its 15th year. Photographer Joel Sartore's lifelong project to make portraits of the world's endangered species conveys a powerful message: To know these animals is to save them.Joel Sartore is committed to documenting every animal in captivity--with a focus on the growing list of endangered species and those facing extinction--cir