What began as a search by two men in 1978 for snakes near the Bosque River became the first and only recorded discovery of a nursery herd of Pleistocene mammoths in the United States. Since its discovery, researchers have unearthed the remains of at least 24 Columbian mammoths, including a large male mammoth as well as the remains of a camel and the tooth of a juvenile saber-toothed cat. The 107-acre site is now an educational and tourism destination, attracting 20,000 visitors a year, including large groups of schoolchildren.

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