(CNN) - The Milwaukee County Zoo is sad to announce the passing of a longtime resident. Patti, the oldest living hippopotamus at an accredited zoo in the United States, has died. Patti had marked ...

The Milwaukee Zoo mourns the loss of Patti, the oldest hippo in U.S. zoos, who was known for her spirited personality. The Milwaukee Zoo mourns the loss of Patti, the oldest hippo in U.S. zoos ...