Fig. 2From: Wintering Swan Geese maximize energy intake through substrate foraging depth when feeding on buried Vallisneria natans tubersMain photograph shows a view of Site B at the study area at Shengjin Lake, China, showing the excavation pits created by Swan Geese (Anser cygnoides) (shown in detail below left) to extract the overwintering tubers of Vallisneria natans (shown cleaned of sediment below right)Back to article page