Prepare to take a journey back in time to witness the most fearsome creatures ever to walk the Earth. Enter hostile habitats; from bug-filled swamps to dinosaur deserts, and meet everything from giant scorpions and mutant reptiles to monstrous snakes and sabre tooth cats. Read on to discover the most weird, strange and terrifying creatures ever to fly, walk and swim our world, read on to discover the terrible tale of life on Earth.