That's the badger!

So first of all, what is a Tasmanian devil?

When the devil bites another devil, it actually physically implants living cancer cells into the next devil, so the tumor continues to grow.

In fact, in the area where she comes from, more than 90 percent of the Tasmanian devil population has already died of this disease.

But the Tasmanian devil population has been undergoing a really extremely fast decline.

My personal aim is to defeat the Tasmanian devil cancer.

So if you think of the word set, a set can be a badger's burrow, a set can be one of the pleats in an Elizabethan ruff, and there's one numbered definition in the OED.

So this Tasmanian devil cancer is perhaps the ultimate cancer.

Fortyfour lions, a zebra, two ostriches and, uh...

Of course, they died along with the mother.

And the answer came from studying the Tasmanian devil cancer's DNA.

And yet, she was feeding three little baby Tasmanian devils in her pouch.

That means that all of these cancers actually are the same cancer that arose once from one individual devil, that have broken free of that first devil's body and spread through the entire Tasmanian devil population.

Well the final piece of the puzzle came when we remember how devils behave when they meet each other in the wild.

And despite their ferocious appearance, Tasmanian devils are actually quite adorable little animals.

This disease appears first as tumors, usually on the face or inside the mouth of affected Tasmanian devils.

Let's prevent the Tasmanian devil from being the first animal to go extinct from cancer.

But that is where the Tasmanian devil cancer has acquired an absolutely amazing evolutionary adaptation.

And just as the Tasmanian devil cancer is contagious through the spread of living cancer cells, so is this dog cancer.

What is killing the Tasmanian devil? A virulent cancer is infecting them by the thousands and unlike most cancers, it's contagious. Researcher Elizabeth Murchison tells us how she's fighting to save the Taz, and what she's learning about all cancers from this unusual strain. Contains disturbing images of facial cancer.

The Tasmanian devil is found only on the island of Tasmania, which is that small island just to the south of the mainland of Australia.

The Tasmanian devil got its name from the terrifying nocturnal scream that it makes.

Well the next breakthrough came from studying hundreds of Tasmanian devil cancers from all around Tasmania.

In fact, growing up in Tasmania, it always was incredibly exciting when we got a chance to see a Tasmanian devil in the wild.

But if this can happen in Tasmanian devils, why hasn't it happened in other animals or even humans?

Scientists around the world were intrigued by this cancer, this infectious cancer, that was spreading through the Tasmanian devil population.

The story begins in 1996 when a wildlife photographer took this photograph here of a Tasmanian devil with a large tumor on its face.

In fact, more genetic profiling told us that this tumor in Jonas actually probably first arose from the cells of a female Tasmanian devil and Jonas was clearly a male.

The Tasmanian devil is predominantly a scavenger, and it uses its powerful jaws and its sharp teeth to chomp on the bones of rotting dead animals.

There he is Sasha.

The Tasmanian devil has shown us that, not only can cancer be a contagious disease, but it can also threaten an entire species with extinction.

But not many people know that there actually is a real animal called the Tasmanian devil, and it's the world's largest carnivorous marsupial.

Rustling

Chutney.

Sleep.

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For what?

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Hi Zina.

Sawley, Derbyshire.

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Machnadebai, Shashai, Sharai,