<P> Other significant areas include stop - over sites between the wintering and breeding territories . A capture - recapture study of passerine migrants with high fidelity for breeding and wintering sites did not show similar strict association with stop - over sites . </P> <P> Hunting along migration routes threatens some bird species . The populations of Siberian cranes (Leucogeranus leucogeranus) that wintered in India declined due to hunting along the route, particularly in Afghanistan and Central Asia . Birds were last seen in their favourite wintering grounds in Keoladeo National Park in 2002 . Structures such as power lines, wind farms and offshore oil - rigs have also been known to affect migratory birds . Other migration hazards include pollution, storms, wildfires, and habitat destruction along migration routes, denying migrants food at stopover points . For example, in the East Asian--Australasian Flyway, up to 65% of key intertidal habitat at the Yellow Sea migration bottleneck has been destroyed since the 1950s . </P>

Where do non migrating birds live in the winter