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The skull of a mammoth found in a man-made pit in Mexico. Researchers say two newly discovered pits are the first known evidence that prehistoric man built mammoth traps. (Edith Camacho/Mexico National Institute of Anthropology and History) At a Glance It's the first known evidence that man engineered traps to catch the massive animals.Hundreds of mammoth bones were found in the man-made pits.Researchers say the two pits could be part of a larger network of traps in the area. Archaeologists...