The central group is believed to breed in western Siberia, especially along the Ob River. These cranes spend the winter in India. Although no one has actually tracked a crane on its migration route, researchers believe the cranes in Siberia fly over Kazakhstan and Afghanistan to reach India's Keoladeo National Park. They believe this because cranes were seen in Kazakhstan and may have even nested there, and several cranes are known to stop in Afghanistan's lakes during their migration. However, cranes of the central group were last seen in 2002, and there were only four cranes. Therefore, many believe this group is now extinct.