Reference

Vlastimil Hart, Erich Pascal Malkemper, Tomas Kusta, Sabine Begall, Petra Novakova, Vladimir Hanzal, Lukas Pleskac, Milos Jezek, Richard Policht, Vaclav Husinec, Jaroslav Cerveny, Hynek Burda (2013): Directional compass preference for landing in water birds – Frontiers in Zoology – 2013: 0001-38-0010.