Huh! Who knew?

Australia's marsupials 'have American roots'

The characteristic koalas, kangaroos, possums and wombats of Australia share a common American ancestor, according to genetic research from Germany.

A University of Muenster team drew up a marsupial family tree based on DNA.

Writing in the Public Library of Science (PLoS) Biology journal, they suggest a single marsupial species moved from the Americas to Australia.

Marsupials differ from other mammals in that mothers carry their young in a pouch after birth.

As well as the familiar Australian species, the family includes the opossums and shrew opossums of North and South America, and also has a presence in Asian countries including Indonesia and Papua New Guinea.

"I think this is pretty strong evidence now for the hypothesis of a single migration [to Australia] and a common ancestor," said Juergen Schmitz, one of the research team