The peculiar "bustle" that hangs over the crane's tail is formed by elongated inner secondaries. This spectacular crane is listed as "vulnerable" based on recent declines and a small total world population, estimated at 5500–6500 individuals. Of these, about 2,000 migrate through Korea, some wintering safely in the demilitarized zone and some continuing to Southern Japan, Here at Izumi a daily feeding program of rice concentrates them. Recent declines have been attributed to drought on their wetland breeding areas and other habitat loss. Formerly included in the genus Grus but now moved to Antigone along with the Sandhill Crane, Brolga, and Sarus Crane based on genetic studies. Canon PowerShot SX60.
References:
Archibald, G.W., Meine, C.D. & Garcia, E.F.J. (2019). White-naped Crane (Antigone vipio). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/53559 on 27 April 2019).
BirdLife International 2018. Antigone vipio. The IUCN Red List of Threatened Species 2018: e.T22692073A131927305. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T22692073A131927305.en. Downloaded on 26 April 2019.