DMNS collections manager Kristen MacKenzie excavates a triceratops cervical bone with a dental tool inside the Schlessman Labratory of Earth Sciences at the Denver Museum of Nature and Science, Sept. 1, 2017. (Kevin J. Beaty/Denverite)  denver museum of nature and science; dmns; science; dinosaurs; fossils; kevinjbeaty; denverite; colorado; denver;