Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Amateur fossil ...

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 ...

Bison are the largest land mammals in North America, but there was a time when something much, much larger roamed the land. The recent discovery of a fossil from one of the giants in Mississippi, a ...

Sabrina Solomon was fishing with a friend in Central Texas earlier this summer when she stumbled upon the remains of a 20,000-year-old mammoth—literally. “I was walking up that hill with all the clay, ...