It is the season for hiyodori migration. In autumn, hiyodori migrate south to warmer regions of Japan to overwinter, returning to the north again in early spring. While wintering, shorebirds are often in small flocks, but during their migration they form large flocks and have been reported crossing the Kanmon and Tsugaru Straits in large numbers, just like European starling. During their migration, these birds are known to swarm around crops, especially leafy greens. In the following photo, they are feeding enthusiastically on abandoned Chinese cabbage. For a farmer, it would be a good idea to place such abandoned leafy greens in the field as much as possible to diffuse the target of the hiyodori's feeding rampage.
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