Bhopal, the capital of the Indian State of Madhya Pradesh, lies in the North-South corridor of the migratory path of birds coming from Northern Asia, Russia, Afghanistan, China, Mongolia etc. Blogger Proloy Bagchi reports that several species of migratory birds which used to congregate in and around the Bhojtal (former Upper Lake) in Bhopal in large numbers, apparently, have avoided this city this winter. Two reasons cited by bird-watchers for the absence of the birds are: 1) human disturbance and 2) pollution in the Lake waters.