Footprints of a capybara are seen on the cracked grounds of the Jaguari dam, part of the Cantareira water supply system, in Joanopollis, 136 km (77 miles) from Sao Paulo February 21, 2014. The water levels of the Cantareira system, which serves 9.3 million residents in Sao Paulo's metropolitan region, reached an all-time low of 17.7 percent. It is the first time in history that the level is below 18 percent, according to Sabesp (Basic Sanitation Company of the State of Sao Paulo). REUTERS/Paulo Whitaker (BRAZIL - Tags: ENVIRONMENT ANIMALS TPX IMAGES OF THE DAY)