Ornis Fennica 2020:4

Ornis Fennica 4/2020 contains the following articles: Sebastian von Numers, Markus Öst & Mikael von Numers, Population changes in the declining Turnstone (Arenaria interpres) and other waders in the northern Baltic Sea based on past and current breeding observations; Ülo Väli & Piia Katharina Vaan, Greenish Warbler (Phylloscopus trochiloides viridanus): An overlooked indicator of old-growth forest? Vojtech Kubelka, Review of inter and intraspecific predation by shorebirds; Marta Witkowska & Wlodzimierz Meissner, Sexual dimorphism in size and plumage in adult Curlew Sandpipers (Calidris ferruginea) migrating in autumn through the Baltic Sea region.