A herd of 100 life-sized elephants has just arrived on Commonwealth Avenue Mall in Back Bay. The sculptures are part of a touring public art exhibition called The Great Elephant Migration. (Robin Lubbock/WBUR)This large tusker is one of 100 elephants on Commonwealth Avenue Mall in Boston, part of "The Great Elephant Migration" installation. Children walk along Commonwealth Avenue Mall in Boston, near a sculpture of a young elephant in "The Great Elephant Migration" installation. The eye of an elephant sculpture on display at an installation of 100 elephants on Commonwealth Avenue Mall in Boston.