BERLIN (Reuters) - A 35,000-year-old flute made from a woolly mammoth's ivory tusk has been unearthed in a German cave by archaeologists, the University of Tuebingen said on Friday. The flute, one of the oldest musical instruments discovered, was pieced together from 31 fragments found in a cave in the Swabian mountains in southwestern Germany, the university said. The mountains have yielded rich pickings in recent years, including ivory figurines, ornaments and other musical instruments. Archaeologists believe humans camped in the area in winter and spring. Mammoths, now extinct, were large elephant-like creatures with hairy coats and long, upcurved tusks....