Well, the earlier point is we interfered in a big way by making these animals go extinct, and many of them were keystone species, and we changed the whole ecosystem they were in by letting them go.

He's not gonna chase me out. I don't care how hard it is.

Don't you mean extinct ?

Extinction.

I'll get them bugs!

In the '30s.

The HlPPO juggernaut we have created, if unabated, is destined according to the best estimates of ongoing biodiversity research to reduce half of Earth's still surviving animal and plant species to extinction or critical endangerment by the end of the century.

And just as everybody got excited about it, bang!

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

Extinct!

There's an upside to the story.

There's an ibex in Spain called the bucardo.

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

One of these diseases, chytridiomycosis, has driven stream dwelling amphibian populations to extinction in Africa,

The ocean's dying.

Dinosaurs became extinct a very long time ago.

Dinosaurs died out a very long time ago.

Sick.

The Carolina parakeet was a parrot that lit up backyards everywhere.

The California condor was down to 22 birds in 1987.

Two years ago, you saw this creature.

In addition to the extinct syphilis bacteria,

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

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

The tear factor reaches 30 or 45 cm,

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

It appears to be a fungally related ailment.

Extinction looms.

We were driven to the wall.

Well, dinosaurs were big, different and gone.

And yet, the type of fishing going on today, with pens, with enormous stakes, is really wiping bluefin ecologically off the planet.

Shape shifting Dinosaurs

The Siberian tiger is on the verge of extinction.

You're looking at a great example here.

And we know who was there.

This is our extinction event.

Why do we need to follow fashion?

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

Alan, this species of Veriforman has been extinct since the Cretaceous Period. I mean, this thing... What?

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

So, maybe spraying DDT on crops is a really bad idea.

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

And there are 12 of them that everyone recognizes

Extinction is part of evolution.

Extinction is a part of evolution.