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This is CBS Eye on the World with John Batchelor. Here's John Bachelor.

Koala, a natural history and an uncertain future. I welcome Professor Danielle Clod, a biologist in South Australia, whose new book about koalas have answered questions not only about where they come from.

They're not bears, they're marsupials, where they come from, how long they've been adapting

to the conditions of the

Australian continent, even back to the time when it included other parts of the globe, but also

what they've faced here in the 21st century with climate change, with natural disaster,

and with people in their habitats.

Professor, a very good evening to you. Congratulations. It is wonderful to speak of the

koala because all I ever knew was the advertising campaign back in the 20th century by

the Australian Airlines. So now that I've met the koala, I want to go

right to a chapter you help me understand what is very different about a koala. This is a marsupial.

We mammals, humans, monkeys, everybody, every mammal around me here in New England is a eutheree.

A marsupial does things very differently. So let us begin with the mating process of marsupials,

...