by Pons, Pere
Published in Avian research (12.05.2020)

by Cramp, Stanley
Year of Publication 1977

by Keast, Allen
Published in The Quarterly review of biology (01.06.2000)

by SHOWLER, DAVE
Published in Bird Conservation International (01.03.2001)

by Clive Finlayson, Finlayson
Year of Publication 31.12.2011

by Delogu, M, De Marco, M A, Donatelli, I, Campitelli, L, Catelli, E
Published in Veterinary research communications (01.09.2003)

by Svensson, Lars, Shirihai, Hadoram
Published in Handbook of Western Palearctic Birds, Volume 2 (2018)

by Showler, Dave
Published in Bird conservation international (01.03.2001)

by SHOWLER, DAVE
Published in Bird conservation international (01.03.2001)

by Keast, Allen
Published in The Quarterly Review of Biology (01.06.2000)

by Keast, Allen
Published in The Quarterly Review of Biology (01.06.2000)

Published in The Economist (27.05.1995)

by Storchová, Lenka, Hořák, David
Published in Global ecology and biogeography (01.04.2018)

by Fitter, Richard
Published in Oryx (01.06.1978)

Published in The Economist (London) (27.05.1995)

by Fitter, Richard
Published in Oryx (01.06.1978)

by Mainwaring, Mark C., Street, Sally E.
Published in Ecology and evolution (01.10.2021)

by MORENO, JUAN, SOLER, JUAN J
Published in Biological journal of the Linnean Society (01.02.2011)

by Gerbracht, Jeff
Published in Biodiversity Information Science and Standards (17.05.2018)

by Patrikeev, Michael, Harper, Geoffrey H
Year of Publication 2004