Blue-headed Wagtail (Motacilla flava) Science Article 2
abstract
Communal roosting of Linnets (Carduelis cannabina) and Blue-headed Wagtails (Motacilla flava) at post-breeding period in Western Poland
Surmacki A, Lorek G & Tryjanowski P., Vogelwarte. vol 40, no 1-2. p. 146-148