Culling of chicken which began in two blocks of Siliguri and one block of Kurseong in birdflu-affected Darjeeling district will continue for another two days, Darjeeling district magistrate Rajesh Pandey said. A total of 20,298 birds were culled in the blocks since May 10, he said. Few thousands were yet to be killed due to non-cooperation in a few villages, he said. It was decided at an emergency meeting on Wednesday that the mopping drive which began on Wednesday would also continue, officials said.