By Will Dunham WASHINGTON (Reuters) - Flower power may have meant the difference between life and death for some of the extinct giants of the Ice Age, including the mighty woolly mammoth and woolly rhinoceros. Scientists who studied DNA preserved in Arctic permafrost sediments and in the remains of such ancient animals have concluded that these Ice Age beasts relied heavily on the protein-rich wildflowers that once blanketed the region. Scientists for years have been trying to figure out what caused this mass extinction, when two-thirds of all the large-bodied mammals in the Northern Hemisphere died out. "Now we have, from my perspective at least, a very credible explanation," Eske Willerslev of the University of Copenhagen, an expert in ancient DNA who led an international team of researchers, said in a telephone interview.{br}{br}View the Entire Article{br}