Long-term and large-scale multispecies dataset tracking population changes of common European breeding birds od Vojtěch Brlík, Eva Šilarová, Jana Škorpilová, Hany Alonso, Marc Anton, Ainars Aunins, Zoltán Benkö, Gilles Biver, Malte Busch, Tomasz Chodkiewicz, Przemysław Chylarecki, Dick Coombes, Elisabetta de Carli, Juan C. del Moral, Antoine Derouaux, Virginia Escandell, Daniel P. Eskildsen, Benoît Fontaine, Ruud P. B. Foppen, Anna Gamero, Richard D. Gregory, Sarah Harris, Sergi Herrando, Iordan Hristov, Magne Husby, Christina Ieronymidou, Frédéric Jiquet, John A. Kålås, Johannes Kamp, Primož Kmecl, Petras Kurlavičius, Aleksi Lehikoinen, Lesley Lewis, Åke Lindström, Aris Manolopoulos, David Martí, Dario Massimino, Charlotte Moshøj, Renno Nellis, David Noble, Alain Paquet, Jean-Yves Paquet, Danae Portolou, Iván Ramírez, Cindy Redel, Jiří Reif, Jozef Ridzoň, Hans Schmid, Benjamin Seaman, Laura Silva, Leo Soldaat, Svetoslav Spasov, Anna Staneva, Tibor Szép, Guido Tellini Florenzano, Norbert Teufelbauer, Sven Trautmann, Tom van der Meij, Arco van Strien, Chris van Turnhout, Glenn Vermeersch, Zdeněk Vermouzek, Thomas Vikstrøm, Petr Voříšek, Anne Weiserbs, Alena Klvaňová