Red-crowned Crane Courtship Dance was added to Your Favorites!
Kushiro Shitsugen NP, Hokkaido
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Despite its name, the dance isn’t reserved for courting: Tsurui Village reports that cranes also dance outside the breeding season, including flocks of unpaired young birds. The moves have more than one social meaning.
Here’s a twist: less-experienced breeding pairs danced more in sync than experienced ones in a 2-year Kushiro study of 21 pairs. Synchrony didn’t predict the next breeding result; researchers suggest it may help new bonds form.
A paired call can do more than courtship. In Kushiro winter flocks, cranes whose duets weren’t drowned out by other pairs were more likely to keep a favorable feeding spot—a joint signal for defending food.
A crane couple’s dance is structured, not freestyle: researchers catalogued 14 movement elements, with pecking, bowing and arching at its core. One bird’s actions help shape what its partner does next.
Elsewhere in Kushiro City, the Akan Ainu preservation society performs Sarorunkamuy Rimse, a traditional crane dance with a different story: a parent crane teaching its chick to fly. It is a human performance, distinct from the birds’ courtship display.
In a related pair call, the male gives “ko” once and the female answers “kakka” twice. Their plumage is alike, but this one-two call-and-response can reveal who’s calling.
A two-year Kushiro study of 21 wild pairs recorded 99 dances and found that performances lengthened as the breeding season drew near. Other measured features did not show the same seasonal change.
