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In this Aug. 15, 2017, photo, a skull of a young Columbian mammoth found at the construction site of the Metro Purple Line extension is placed on a cart at the La Brea Tar Pits and Museum in Los Angeles. The Los Angeles subway system is expanding and so too are the number of prehistoric fossils being recovered as crews dig beneath the city. (AP Photo/Jae C. Hong)

In this Aug. 15, 2017, photo, a skull of a young Columbian mammoth found at the construction site of the Metro Purple Line extension is placed on a cart at the La Brea Tar Pits and Museum in Los Angeles. The Los Angeles subway system is expanding and so too are the number of prehistoric fossils being recovered as crews dig beneath the city. (AP Photo/Jae C. Hong)

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