Book excerpt: Examined. In Ghost Bears, R. Edward Grumbine looks at the wide-ranging implications of this crisis and explains why our species-centered approach will ultimately fail to protect ecosystems and diversity. Using the fate of the endangered grizzly bear - the "ghost bear"--To explore the causes and effects of species loss and habitat destruction, Grumbine presents a clear assessment of the biodiversity crisis and introduces the new science of conservation biology. While.