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.
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