Tia Ghose | Apr 22, 2009 | 3 min read
Scientists have used traces of retrovirus DNA to map ancient sheep migration across Asia, Europe, and Africa, a paper in this week's Science reports. The results may help settle a debate about where humans first bred sheep for their white, fleecy coats, the researchers say. Soay sheep on St. Kilda, Outer Hebrides Image: Arpat Ozgul "What's neat about [the study] is that you're learning something about humans indirectly by studying animals that they brought along with them," said Welkin Johnson