Despite weighing 3,000 to 4,000 pounds, being almost hairless and pink-faced, this hippopotamus still manages to smile while resting. This semiaquatic relative of whales lives in the southern half of Africa. Or you can find a pod of these river horses at the 26 acre Antwerp Zoo. It is located in the center of the city just off Astrid Square and next to the beautiful Antwerpen-Centraal train station.