The natural world is made up of non-living things and living beings. Among the living beings, it is estimated by scientists that over 8.7 million species of animals exist (2021)! Most of them live on land, and the rest in the oceans. We do not see many of these animals in our daily lives, as only a few of them are domesticated and tame enough, to live hand-in-hand with the human society. But most of the popular "flagship" animals are often found in the zoos, where they are conserved in an artificial, but aesthetically close to their natural habitat. They are an excellent site to learn more about the animals and see them in action! But did you know that the mighty lion sleeps for over 20 hours in a day, or that the one-horned rhinoceros weighs in up to 2.5 tonnes, which is more than 36 adult humans? The fact that the sacred langur has more than ten types of distinct calls brings to attention how intelligent these animals are. These less-known facts about animals are both fun and resourceful to be in the know about the exciting world of animals. In this book, discover the secret facts about animals, how they were known to ancient humans, what are their common identifications marks, and more! Learn the facts that you need to know, and nothing that you don't! Have a happy reading!