This video from the Netherlands is called Kemphaan / Ruff / Philomachus pugnax @ Ezumakeeg Zuid, Lauwersmeer 16-05-2016.
From the Cornell Lab of Ornithology in the USA:
Not All Ruffs Are Tough—The Secret Life of the World’s Most Glamorous Shorebird
The male Ruff sports opulent plumage that seems more worthy of a bird-of-paradise than a shorebird. But the birds are living proof there’s more than one way to get ahead in the world. Some males even impersonate females in order to avoid fights on the breeding grounds, while still winning mates. Read more.
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