Walter Jetz, Cagan H Sekercioglu, Katrin Böhning-Gaese: The Worldwide Variation in Avian Clutch Size across Species and Space.Anhang S4 (PDF; 562 kB), doi:10.1371/journal.pbio.0060303
Walter Jetz, Cagan H Sekercioglu, Katrin Böhning-Gaese: The Worldwide Variation in Avian Clutch Size across Species and Space.Anhang S4 (PDF; 562 kB), doi:10.1371/journal.pbio.0060303