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The clams, Nymphalucina occidentalis, once lived in what is now South Dakota, where an inland sea divided western and eastern North America. While examining the shells, now at the American Museum of Natural History in New York, paleontologists Adiel Klompmaker of the University of Alabama in Tuscaloosa and the museum’s Neil Landman spotted telltale oval-shaped holes. Each hole was between 0.5 and 1 millimeters in diameter, thinner than a strand of spaghetti.