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TUCSON, Ariz. — The discovery of prehistoric human remains just miles from the suspected abduction of Nancy Guthrie has unearthed a grim reality of Arizona's Sonoran Desert, where an expert says a dozen or more bodies can surface in a given year, and "there's just so much space" to conceal them.

Guthrie is the 84-year-old mother of "Today" co-host Savannah Guthrie, and as a result of her daughter's high profile, the grim discovery quickly caught national attention.

Just as quickly, experts determined the remains had nothing to do with her case.

In an interview with Fox News Digital, James T.…