According to the Wikipedia Japanese
descriptions,
It breeds
from Tibet to the northeastern part of China, Primorsky region, and Lake
Baikal, and in the non-breeding season, it will come over to Japan, South
China, northern Indochina Peninsula and overwinter
In Japan,
it will come over as a winter bird through nationwide, but in Korea, it is a
resident bird.
This summer
was a record-breaking record heat. Even it entered in December, the high
temperature has lasted until these few days.
I do not
know if this is due to abnormal weather, but I feel that winter migrant birds
coming over in winter are a few.
この夏は記録的な暑さでした。それは12月に入っても、高温は、これらの数日まで続いています。
この異常気象によるものかどうか解りませんが、冬に渡ってくる冬鳥が少ないように感じます。