Near midnight, a group of six Guajajara tribesmen with their faces painted for battle listen to the rumble of heavy trucks about 19 miles (30 km) from their village in the Amazon rainforest. They suspect a caravan of illegal loggers felling trees on their reservation. The police are not coming, but the natives have a plan to fight back. The "forest guardians," as they call themselves, hurry to a choke point in the local network of rutted dirt roads and lay in wait, armed with rifles and handguns. As the trucks approach, they ready themselves to spring an ambush, apprehend the loggers and deliver the culprits, along with their equipment, to the nearest federal police station, hundreds of miles away. The men say they are among some 180 guardians patrolling their tribal land against loggers on night missions. REUTERS/Ueslei Marcelino SEARCH "MARCELINO GUARDIANS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY Matching text: BRAZIL-ENVIRONMENT/GUARDIANS