KOLKATA: Rhino census in West Bengal will begin from March 12, forest minister Hiten Barman said. "Authorities concerned have already been asked to take appropriate steps in this regard," he said here. Besides, there could be an amendment to the Bird Conservation Act to save winged species, he said. To prevent leopards often entering into tea gardens, Barman said steps were being taken to restrict the movement of leopards within the limit of sanctuaries.