BROOKFIELD, Illinois, July 26 -- Brookfield Zoo Chicago issued the following news release: A new North American Prairie Aviary, home to sandhill cranes and greater prairie chickens, is now open at Brookfield Zoo Chicago. As populations of the greater prairie chicken are decreasing and the Mississippi subspecies of sandhill crane faces extinction, this space and its inhabitants bring awareness to the conservation challenges facing native bird species. While observing these birds, zoogoers can ga more PR