The woolly mammoth really got around. During the most recent Ice Age (between 110,000 and 12,000 years ago), woolly mammoths roamed more than 12.8 million square miles of territory in the northern hemisphere, according to a new study by paleontologist Ralf-Dietrich Kahlke of the Senckenberg Research Institutes and Natural History Museums in Germany. 

The study, published in the journal Quaternary International, is based on a compilation of data on excavation sites where fossilized remains of the extinct woolly mammoth have been found. Kahlke computed the area that the mammoths would have roamed at the time, based on the differences in land surface thousands of years ago. (Sea levels were much lower during the Ice Age since more of the water was frozen in glaciers.) Mammoth remains have been found in Portugal, in the Midwest United States, in Siberia, and near the Adriatic Sea, among other places. The map above represents the most comprehensive data so far on their full range of habitats.