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It’s not unusual today to find swans on rivers and lakes, splitting their time between pulling up water plants and punishing the unwise with powerful blows of their bony-elbowed wings.

Eleven million years ago, however, swans in what is today called Japan did something unexpected: They took to the oceans. In a paper published this week in The Bulletin of Gunma Museum of Natural History, Japanese paleontologists formally described this family or genus of swans, Annakacygna, which had long, filter-feeding heads, small wings and seriously strange hips — all of which have led the researchers to call it the “ultimate bird.”

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