In Japan, where it was once common for them to winter, they became extremely rare at this same time, and in later years there has never been a winter in which more than 5 birds were observed.
I Japan, hvor den var almindelig som overvintrende, blev den voldsomt sjælden i samme periode, og i de seneste år har man ikke haft en vinter, hvor man har observeret mere end 5 fugle.