Tiger scat will be collected for DNA sampling which is a foolproof method to establish their number, Field Director of Sunderbans Tiger Reserve Subrat Mukherjee said.

The exercise will continue till March 9. Scat collection, however, would be a long-drawn process because Sundarbans has a vast and difficult terrain, said Pradeep Vyas, Director of Sunderban Biosphere Reserve.

“It will take an entire year to complete collection of scats in over 100 compartments in the Sunderbans, which includes a part of North 24 Parganas district besides the tiger reserve,” Vyas added.

Altogether 35 teams comprising 250 forest personnel and representatives of NGOs were taking part in total ecological monitoring, which include tigers, co-predators, prey, habitat and human interference, Vyas said.

Asked whether it would be possible to have an approximate count of tigers in Sunderbans immediately after the collection of data, he said the data would take two months to process after which it would be sent to the Dehradun-based Wildlife Institute of India.

“After this we have to add the figures from DNA sampling of the tigers,” Vyas said.