Add Yahoo as a preferred source to see more of our stories on Google. Bison are the largest land mammals in North America, but there was a time when something much, much larger roamed the land. The ...

We tend to lump all mammoths together as big, hairy elephant-like beasts with enormous tusks. But there were a number of mammoth species, including less furry ones that inhabited temperate regions.

North America's mammoth species were breeding together within the past 40,000 years. Fossil teeth found in Canada show that Columbian and wooly mammoths regularly had calves together where the ...