MILLFIELD — A routine feeding at Millfield Zoo became an underground melee when Gerald, a 14-foot Masai giraffe, and Henrietta, a 3,200-pound hippo, locked eyes on the last watermelon. Within minutes, the African Savanna exhibit morphed into a makeshift colosseum. Betting pools appeared. Spectators chanted. Security footage showed “classic pre-fight posturing,” with Gerald stretching tall while Henrietta snapped jaws like a trap. “I’ve never seen anything like it,” said grandmother Margaret Thornwell, who won $47 on Gerald’s reach. “One minute they’re staring. Next, Gerald’s spinning neck attack. My grandson yelled ‘FINISH HIM!’ and, honestly, same.” Zookeepers charged in with pool noodles and air horns. “The crowd went wild,” said keeper Janet Mills. “People were shouting ‘Hoof Stomp Supreme’ and ‘Aquatic Body Slam.’ Popcorn flew like confetti.” The climax came with Gerald’s “Neck Whip Fatality,” flipping Henrietta into the watering hole and soaking the first three rows. Director Harold Pemberton announced a referee booth, stadium lights, and talks with ESPN. “Gerald vs. Henrietta II: The Reckoning,” he said, “with peacocks on the undercard.” Animal rights groups frowned. Gerald practiced his victory dance.