This park is one of the few tropical forests in the world within the limits of a capital city.  Its 265-hectares are home to 186 of the more than 900 species of birds found throughout Panama and a number of mammals and amphibians scurry, squirm and hop beside its numerous nature trails. The park is the site of extensive tropical rainforest research. (A small donation  is charged as an entrance fee. Call 232-5552)