Revellers from the Porto da Pedra samba school parade on the first night of the annual Carnival parade in Rio de Janeiro's Sambadrome February 20, 2012.[Photo/Agencies]

Drum queen Antonia Fontenelle of the Mocidade samba school dances on the first night of the annual Carnival parade in Rio de Janeiro's Sambadrome February 20, 2012.[Photo/Agencies]