The cockerel's splendid red cockscomb is thought to play a part in determining gender and breed.

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The reason is unknown, however, some researchers consider that since the method of extraction was changed to froth flotation (flotation) in the Taisho period, copper waste became smaller enough to float on the river, and that a lot of those wastes accumulated in the right side of the upper stream of Watarase-gawa River.