Fig. 1

Autumn migration routes of ten successfully tracked Common Shelducks (Tadorna tardorna) using GPS/GSM telemetry devices from Mongolian moulting areas to Chinese wintering quarters. The yellow and blue triangles represent post-breeding and wintering sites respectively; green circles show individual stopover sites and their size corresponds to stopover duration. The solid heat lines show the individual migration tracks, their colour corresponding to migration speed. The grey dashed lines directly connect two consecutive GPS fixes across a data gap (usually due to low battery charge)