The private Dallas company is behind efforts to resurrect the mammoth and other extinct animals. Colossal said its woolly mouse would enable its scientists to test hypotheses about the link between specific DNA sequences and physical traits that enabled the mammoth,

Scientists at a Dallas-based biotech company has unveiled a genetically engineered woolly mouse that they hope is a step toward eventually bringing back the wooly mammoth. The results haven't yet been published or vetted by independent scientists.

The biotech company Colossal Biosciences has long aspired to bring back the extinct woolly mammoth, which roamed the Northern Hemisphere thousands of years ago, during the last ice age. But for now, as a step along the way, the company has come up with something decidedly less mammoth: meet the woolly mouse.