ハクセキレイの集団性と集団就眠に就いて
1960 年 15 巻 76 号 p. 290-291
詳細
1960 年 15 巻 76 号 p. 290-291
In Toyama, the Pied Wagtail has been observed (1957-1959) in flocks when arriving and up to 200 birds roosted every year on iron and concrete bridges of River Sho near Shinminato through the winter, except when heavy snow.
