Discover the Most Amazing Animals that First Ruled the World! Join Anna and Tyler, your teenage hosts, as they take kids on a prehistoric journey to learn everything they ever wanted to know about dinosaurs. Dinosaurs were, by far, the most diverse and amazing animals that ever walked the Earth. Some dinosaurs were as big as trees ... Others were smaller than a chicken ... Some had big sharp teeth ... Some had hundreds of tiny flat teeth ... And some had feathers while others had scales. Because of this diversity, dinosaurs were the most successful land-dwelling animals that ever lived. They lived everywhere on the Earth in every type of environment ... They adapted to almost any condition. They were some of the first creatures that lived on Earth.