This May 13, 2017 photo shows a bison sculpture on the Pearl Street Mall in Boulder, Colo. Pearl Street has been Boulder's main shopping district since the late 19th century and a pedestrian mall since the late 1970s. Today its historic storefronts have been restored and it bustles with shoppers, street performers and children at play. The bison sculpture is a temporary installation. (AP Photo/Beth J. Harpaz)