Spectacular, mysterious, elegant, or grotesque, the vertebrate skeletons of Earth's fossil record carry within them the traces of several billion years of life. Evolution in Action, a resounding success on its initial publication in 2007, is a unique and beautiful attempt to provide a map of those billion years in time. Now updated and presented in a smaller format with seventeen new utterly distinctive photographs, this book steps beyond the debate and presents the undeniable truth of Darwin's theory, showing through 200 photographs of skeletons both obscure and commonplace, but always intriguing, the process by which life has transformed itself, again and again.