This photo taken March 31, 2011 and provided Sept. 6, 2011 by the Chicago Zoological Society, shows Nea, a 4-year-old Atlantic bottlenose dolphin at the Brookfield Zoo in Brookfield, Ill. Officials at the zoo say Nea died Monday, Sept. 5, 2011, after apparently colliding with another dolphin. A preliminary examination indicates Nea suffered a fractured skull. The accident happened Monday afternoon before the dolphins were scheduled to perform for zoo visitors. (AP Photo/Chicago Zoological Society, Jim Schulz)