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11 Of Ancient Earth’s Most Unbelievable Prehistoric Animals
For nearly 30 million years, a 2,000-pound beast known as the entelodont ruled a sweeping empire from Mongolia to what is now ...
National Geographic news8mon
Cambrian Period
With many varieties and sizes—they ranged from a millimeter to more than 2 feet (0.6 meters) in length—trilobites proved among the most successful and enduring of all prehistoric animals.