A comment: "Just because they can, doesn't mean they should."
They say this:
Prof Richard Behringer, of the University of Texas, added: "This research has enormous potential for many applications including gaining a better understanding of the biology of extinct animals."
"At a time when extinction rates are increasing at an alarming rate, especially of mammals, this research discovery is critical," says Professor Marilyn Renfree, the University of Melbourne's senior author on the paper.
"For those species that have already become extinct, our method shows that access to their genetic biodiversity may not be completely lost."