Figure 3. Distribution map of the sandhill cranes in Asia during the non-breeding period.

(A) is a schematic diagram showing the distribution of sandhill cranes in East Asia during the non-breeding period before 2000; (B) is a schematic diagram showing the distribution of sandhill cranes in East Asia during the non-breeding period before 2009; (C) is a schematic diagram showing the distribution of sandhill cranes in East Asia during the non-breeding period before 2017. The red circle indicates the distribution point between 2010 and 2017; the blue circle indicates the distribution point between 2000 and 2009; and the green circle indicates the distribution point before 2000. The light pink box indicates that the number of distributed records in this area is from 1 to 10; the pink box indicates that the number of distributed records in this area is from 10 to 20; and the red box indicates that the number of distributed records in this area is from 20 to 40.