This was stated in a meeting of the state board for wildlife chaired by chief minister Lal Thanhawla here.
The presence of the camps of rebel groups in Bangladesh near the border areas has necessitated the construction of border fences and also establishment of border police outposts, BSF officials state.
The border fencing within Dampa Tiger Reserve was estimated at 62km and there would be seven corridors measuring 100 metres each on the fencing where animals could have free passages between the two countries.
The BSF authorities emphasised the need for creation of corridors for the wild animals without endangering the national security.