MCU of Rainer Wirth climbing rope. MS of spider monkey with baby climbing in branches. MCU of Wirth using instrument. LS of Rainer Wirth hanging high over rainforest canopy from rope suspended from tree branch, operating equipment. MS of black-handed spider monkey and baby in tree branches, baby scratching its head. MS of tree-covered hillside, research vessel appearing from behind trees. CU of head of keel-billed toucan. AER of Barro Colorado Island. CU of hand extending white pole with numbers on it. MLS of man standing at base of tree, measuring it. Series of shots of workers measuring trees in stand of forest. (292)