Cat-sized 'Lumakoala' could be marsupials' missing link in Australia's Northern Territory
                                
                                
                                    (Newser) -
                                    The modern koala is a well-known and well-loved marsupial, but researchers know surprisingly little about its evolution. Indeed, they describe an "approximately 30-million-year-gap" in the fossil record of Australian marsupials, or diprotodontians, a group including kangaroos, wallabies, and wombats. That gap may be closing, however. Researchers say they've...