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This is CBSI in the world. I'm John Batchewitt. Professor Daniel Claude. Her new book is Koala, a natural history and an uncertain future. This is a marsupial. And there are many

different kinds of marsupials. There's a family tree.

Kuala is all by itself. It's phylogenetically sterile. See, I learned it, Professor.

What does that mean? That's an interesting phrase. I mean, the idea is that they're the last

of their line. So a little bit like humans, we used to have a whole heap of other relatives in the homo family,

or the homo group of species, but where the last ones left,

the Neanderthals have tied out, lots of other homo species have died out as well.

And koalas are in the same camp.

So they had lots of other cousins around them at one point,

but now there's only one species left.

So it's the sort of the end of the line for them.

Once upon a time.

So go ahead.

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