National Geographic The Photo Ark Limited Earth Day Edition: One Man's Quest to Document the World's Animals

This special edition comes with a free poster 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--circling the globe, visiting zoos and wildlife rescue centers to create studio portraits of 12,000 species.

Paired with the eloquent prose of veteran wildlife writer Douglas Chadwick, and with a foreword by Harrison Ford, Sartore's animal portraits are riveting: from tiny to mammoth, from the Florida grasshopper sparrow to the greater one-horned rhinoceros.