The age of zoological discovery has not passed. Every year, spectacular and exciting new species are being located and classified, adding to our knowledge of the animal kingdom. New whales, deer, snakes, sharks, and birds are just some of the creatures we have learned about in the past decade. Moreover, the seas and forests continue to conceal unsolved mysteries of zoology. Are there undiscovered big cats and unclassified apes hidden in the world's forests? Do large animals of unknown type lurk in deep lakes or in the oceans? The discoveries, rediscoveries, controversies, and mysteries of modern zoology are collected here in Shadows of Existence, a thoroughly researched and up to date guide to the wonders of nature.