Fig. 3

a East Asia map of the breeding (green) and wintering (blue) distribution of the Eurasian Spoonbill. b Enlarged map of the same detailed wintering inland in China, showing the dichotomy between birds breeding in western Mongolia (autumn migration routes (N = 8); spring migration routes (N = 3)) and that caught at Hulun Lake, Inner Mongolia (autumn migration routes (N = 1); spring migration routes (N = 1)). Circles with central black dots indicate capture sites, inverted triangles summering sites, regular triangles wintering sites and yellow dots show areas used during summer, the black cross-hatched area represents the Yellow River Basin and the Yangtze River Basin. The distribution data of the Eurasian Spoonbill are derived from Xi (2021)