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The Breeding Cycle in Calendar Form of the Common Swift Apus apus across its Eurasian Breeding Range – A Testable Hypothesis?



(Printed 2006 in Podoces. Republished with permission.)

ISSN 1438-2261



The Commonswift Calendar: http://www.commonswift.org/The-Swift-Calendar.html


Original paper: http://www.wesca.net/Podoces/podoces1.html