This video is called Spoon-billed Sandpiper: Courtship.
From the RSPB site in Britain, with photos there:
Continuing the international effort to survey the critically endangered Spoon-billed Sandpiper in China
Rudong County is just 2 hours’ drive north of Shanghai. The mud flats along this part of the Yellow Sea coast, in China’s Jiangsu Province, are a critically important staging post in the spring and autumn for migrating spoon-billed sandpipers (‘Spoonies’) and for the tens of thousands of migrating shorebirds that move along the East Asian-Australasian flyway between their breeding grounds in the Arctic and their wintering grounds far to the south.
In recent years, important numbers of spoon-billed sandpipers have been recorded in this area during spring and autumn, and international teams have carried out coordinated surveys…
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