Agua Salud Experiment Tree Planting Design (image) Smithsonian Tropical Research Institute Share Print E-Mail Caption Tropical forests are home to many species, but they are often very rare. Only a few individuals of a given species are present in a forest. The planting design of the Agua Salud Experiment makes it possible for scientists to take an average: they have enough individuals of each species to better understand if their behavior is representative of the group. Credit Jorge Aleman, STRI Usage Restrictions Credit: STRI Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.