Researchers, Anavilhanas Reserve, Brazil, 1982Photograph by James P. BlairResearchers from the National Institute for Amazonian Studies (INPA) use nets to collect specimens of pacu, a fish that eats fruits and nuts, on the Rio Negro in Amazonas state, Brazil. INPA scientists, financed by the World Wildlife Fund, monitor flora and fauna on plots of untouched rain forest in large areas where the trees have been cut and burned to establish cattle reserves.