Ornis Fennica 2022:1

Ornis Fennica 1/2022 contains the following articles: Jan Ove Bustnes, Morten Helberg & Bård-Jørgen Bårdsen, Reproductive success of threatened northern Lesser Black-backed Gulls (Larus fuscus fuscus) in relation to nest predation by Ravens (Corvus corax); Pekka J. Lehtonen & Jyrki Lappalainen, Individual variation in song of Black-throated Divers (Gavia arctica); Henning Heldbjerg, Anthony D. Fox, Thorsten J. S. Balsby & Peder V. Thellesen, Nightbrooding behaviour in provisioning cavity-nesting birds is a trade-off between adult predation risk and nestling thetmoregulation needs.