This photo provided by the Chicago Zoological Society shows, golden lion tamarins, Diabo, left, and Delilah, small, orange-colored primates that have been in a wooded area adjacent to Brookfield Zoo’s Indian Lake for the summer, Tuesday, June 29, in Brookfield, Ill. Diabo and Delilah are able to forage for food and explore the open woods on their own; they will use their long tail for balance when climbing through the trees as well as use their long fingers for grabbing branches, holding fruit, and reaching into crevices to catch insects. The tamarins, native to Brazil, are fitted with radio transmitters so Animal Care staff can track them if they are ever out of sight. (AP Photo/Chicago Zoological Society, Jim Schulz)