Forest officials of Srisailam Tiger Reserve have begun tiger census in the Nallamala forest. During the weeklong exercise, the teams will count the pugmarks at water-holes. Nearly 200 teams are scurrying the forest existing on 3,000 sq km. Assistant Conservator of Forest and in charge of bio-diversity wing Tulasi Rao told The Hindu that the survey was meant for annual review and updating of records. According to him, only tigers and panthers would be counted during the current exercise, which would end on May 7.