A mouse, whose species was believed to have been extinct more than 150 years ago, has been rediscovered in Australia. Researchers further compared the DNA samples from eight extinct native rodents and 42 of their living relatives, to conclude that the ‘extinct’ was indistinguishable from the Shark Bay mouse, which is found on several small islands off the coast of Western Australia, reports The Guardian. The study, that was published in the journal Proceedings of the National Academy of Sciences of the United States of America or PNAS, has helped scientists understand better what must have led to the decline of native species since the arrival of Europeans in Australia.