Insects: 105 Years of Collecting The Field Museum's entomologists have accumulated one of the largest collections of insects in the Western Hemisphere. The Museum's collection is expanding constantly through field work, purchases, and donations. Some of the most remarkable specimens-along with fascinating collectors' stories-are presented in the Small Treasures gallery. Come and see giant beetles and butterflies, 40 million-year-old insects in amber, and other wonders. Insects: 105 Years of Collecting is free with regular Museum admission. Learn more at the web site, Butterflies at The Field Museum.