Ornis Polonica 2011, 52: 231–246
Variation of the Great Cormorant Phalacrocorax carbo sinensis breeding phenology in the biggest European colony in Kąty Rybackie (Vistula Spit,N Poland)
Anna Buczma, Michał Goc, Wojciech Kosmalski
Ornis Polonica 2011, 52: 247–254
Numbers, distribution and breeding habitat of the Bearded Reedling Panurus biarmicus at the Łoniewskie Lake (Wielkopolska region, W Poland) in 1986–2011
Janusz Stępniewski
Ornis Polonica 2011, 52: 255–264
Inland migration of the Arctic Tern Sterna paradisaea in Poland
Łukasz Ławicki, Tadeusz Stawarczyk
Ornis Polonica 2011, 52: 265–274
Avian influenza in free-living populations – selected epidemiological aspects with special regard to H5N1 infections
Krzysztof Śmietanka, Włodzimierz Meissner
Ornis Polonica 2011, 52: 275–279
Next changes in the taxonomy of Polish birds
Tadeusz Stawarczyk
Ornis Polonica 2011, 52: 280–287
The usefulness of various methods of monitoring the population sizeof the Syrian Woodpecker Dendrocopos syriacus
Jerzy Michalczuk, Monika Michalczuk, Robert Cymbała
Ornis Polonica 2011, 52: 288–291
First breeding of the Blyth’s Reed Warbler Acrocephalus dumetorumin Poland
Tomasz Tumiel, Grzegorz Grygoruk
Ornis Polonica 2011, 52: 292–294
Mystery bird 65: Montagu’s Harrier Circus pygargus
Jan Lontkowski
Ornis Polonica 2011, 52: 295–300
Numbers of waterbirds on the Bay of Gdańsk between May 2010 and April 2011
Włodzimierz Meissner, Szymon Bzoma, Piotr Nagórski, Gerard Bela, Piotr Zięcik, Magdalena Wybraniec, Antoni Marczewski
