Step back over 300 million years to the Carboniferous period, a time of giant amphibians, fierce freshwater sharks, and colossal arthropods ruling Earth's swamps and rivers. This A-Z guide unveils the top apex predators of this lost world-creatures armed with armour, venomous spines, and razor-sharp teeth. Discover the fascinating adaptations and fierce battles that shaped prehistoric ecosystems long before the age of dinosaurs.