SOUTH BOSTON. This rapidly growing 72-acre zoo is full of a variety of different animals great and small. Special exhibits include Bongo Congo with bongo antelopes and ostriches. The African Tropical Forest contains over 50 types of animals wandering in a man-made "natural" habitat. The Australian Outback Trail allows visitors to mingle with kangaroos and emus. There is something for everyone in this land of exploration and fun.