What were the dinosaurs? -- How do we know about them? -- When and where did they live? -- What are the different types of dinosaurs? -- Dinosaur time line -- Triassic prosauropods -- Triassic therapods -- Jurassic sauropods -- Jurassic ornithopods -- Jurassic therapods -- Jurassic armor -- Cretaceous sauropods -- Cretaceous therapods -- Cretaceous ornithopods -- Cretaceous ceratopsians -- Cretaceous armor -- Cretaceous pachycephalosauria -- Why aren't there any dinosaurs around today?