&i;`Keepers of the Kingdom'&o; is the culmination of photographer Michael Nichols' two-year odyssey to document the sweeping changes that are occuring throughout America's most advanced zoological gardens. The result is a groundbreaking work, a tour of the most innovative American zoos. Nichols' remarkable photographs portray the vital connections that zoos make possible and are accompanied by his own introduction as well as thought-provaking essays from six innovators who are shaping the zoo in the 21st century.