This story began in the seventies. Then the American ornithologist George Archibald turned to Soviet scientists led by Vladimir Flint with a proposal to cooperate in the protection of the white Siberian crane. This species was little studied and was considered endangered. Since then, we know much more about white cranes. Now on Earth there are two disparate populations of Siberian Cranes. One is East Siberian. These birds nest in the north of Yakutia and migrate to China. There are more than three thousand of them, and in the near future they are not threatened with extinction. A few thousand kilometers away, another population of Siberian Cranes lives. They nest in the lower reaches of the Ob, and fly to India or Iran for the winter. There are only twenty of them left. This film is about how people are trying to save this West Siberian branch of white cranes.