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[Dr. Alice Roberts] How do you start to get close to animals that lived hundreds of millions of years ago?

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Dinosaurs

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[Dallas Campbell] Dinosaurs weren't just giant lizards

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But a truly unique kind of reptile

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[Narrator 1] Dinosaurs roamed for more than 150 million years

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Dinosaurs roamed in amazing shapes and sizes

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Very few left evidence of their existence

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And those bones never cease to fascinate us

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[Roberts] The more we find, the more complete our understanding

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Utterly awe-inspiring

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The world of the dinosaurs

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[Campbell] There are always new discoveries out there

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Waiting to be found

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[Roberts] The more we find, the more complete our understanding

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Utterly awe-inspiring

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The world of the dinosaurs

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[Narrator 2] Tyrannosaurus, the largest flesh eater the world has ever seen

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Dinosaurs - all the dinosaurs- Followed a well trod trail to oblivion

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Rock layers span the age of dinosaurs

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The deeper the layer, the older the rock

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At the top - rock from the Cretaceous

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Below that, the Jurassic

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And near the bottom, red Triassic badlands

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When dinosaurs first appeared

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[Roberts] The more we find, the more complete our understanding

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Utterly awe-inspiring

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The world of the dinosaurs

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[Nye] 65 million years ago

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[Nigel Marvin] A meteorite smashed into the Earth

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[Nye] Hurtling toward our planet

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At a hundred thousand kilometers a second [an hour]

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[Roberts] If we'd never found their bones, we wouldn't ever have known

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These ancient animals ever existed

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we wouldn't ever have known

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These ancient animals ever existed

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The more we find, the more complete our understanding

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Utterly awe-inspiring

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The world of the dinosaurs

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[Campbell] There are always new discoveries out there

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Waiting to be found

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[Roberts] The more we find, the more complete our understanding

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Utterly awe-inspiring

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The world of the dinosaurs

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[Campbell] There are always new discoveries out there

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Utterly awe-inspiring - The world of the dinosaurs