Well, dinosaurs were big, different and gone.

Don't you mean extinct ?

Extinction.

Kiwis are, and so are these hawks trapped near Antarctica.

He couldn't match it up to any bones on the planet, and he said, Aha!

I'll get them bugs!

In the '30s.

We failed against malaria, yellow fever and yaws.

So that's sort of the theme big, different and gone.

But at the same time, conservation biologists are realizing that bad news bums people out.

The tear factor reaches 30 or 45 cm,

And just as everybody got excited about it, bang!

We stand on the precipice of a dramatic moment of choice.

Extinct!

And I'm not talking about losing diversity in the same way that you lose your car keys.

If it had not been illegal to keep these thylacines as pets then, would the thylacine be extinct now?

And that's a good number.

There's an upside to the story.

There's an ibex in Spain called the bucardo.

All the grayed out species disappear.

These are two creatures that were created in order to save endangered species.

Well, there are five major mass extinctions over the last 500 million years, called the Big Five.

According to a surgeon's survival curve they cannot survive more.

You're looking at a great example here.

And we know who was there.

Your doom is near at hand.

The ocean's dying.

The documentation of this animal goes back to the Lascaux cave paintings.

The danger is not at all unprecedented.

Dinosaurs became extinct a very long time ago.

Dinosaurs died out a very long time ago.

I thought that deadly disease was extinct. Yes, it was wiped from the galaxy generations ago, but I have given it life once again.

Sick.

Whatever you hear, stay away.

Elephants are in danger of dying out.

The Siberian tiger is on the verge of extinction.

Shape shifting Dinosaurs

Of the 15 percent evaluated, 20 percent are classified as in peril, that is, in danger of extinction.

Extinction is part of evolution.

Extinction is a part of evolution.

Nearly one third of the world's amphibian species are endanger of extinction, and over 100 species have already disappeared.

Two years ago, you saw this creature.

In addition to the extinct syphilis bacteria,

Few believers left, I think.

If this continues, the Klingon species will cease to exist.