During the last two centuries, tiger population has been extirpated from about 1,000km² of its historic range in Northern West Bengal and dwindled at an alarming rate in their last refuse, i.e. the protected areas, spread over >1,000km², due to increasing anthropogenic pressures and other reasons. Intra-state and inter-state migration of the tigers, usually on a seasonal basis, is also reported from these protected areas, leading to very much lower population than in ecologically comparable sites in India.