*Swallow videos on the Internet Bird Collection*The evolution of nest construction in swallows (Hirundinidae) is associated with the decrease of clutch size paper in Linzer Biologische Beiträge
* Swallow videos on the Internet Bird Collection* The evolution of nest construction in swallows (Hirundinidae) is associated with the decrease of clutch size paper in Linzer Biologische Beiträge