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

Dinosaurs

[Dallas Campbell] Dinosaurs weren't just giant lizards

But a truly unique kind of reptile

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

Dinosaurs roamed in amazing shapes and sizes

Very few left evidence of their existence

And those bones never cease to fascinate us

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

Utterly awe-inspiring

The world of the dinosaurs

[Campbell] There are always new discoveries out there

Waiting to be found

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

Utterly awe-inspiring

The world of the dinosaurs

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

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

Rock layers span the age of dinosaurs

The deeper the layer, the older the rock

At the top - rock from the Cretaceous

Below that, the Jurassic

And near the bottom, red Triassic badlands

When dinosaurs first appeared

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

Utterly awe-inspiring

The world of the dinosaurs

[Nye] 65 million years ago

[Nigel Marvin] A meteorite smashed into the Earth

[Nye] Hurtling toward our planet

At a hundred thousand kilometers a second [an hour]

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

These ancient animals ever existed

we wouldn't ever have known

These ancient animals ever existed

The more we find, the more complete our understanding

Utterly awe-inspiring

The world of the dinosaurs

[Campbell] There are always new discoveries out there

Waiting to be found

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

Utterly awe-inspiring

The world of the dinosaurs

[Campbell] There are always new discoveries out there

Utterly awe-inspiring - The world of the dinosaurs