Denmark being a country with only a few suitable steep nesting cliffs has only harboured a small population of Peregrine Falcons (Falco peregrinus) in historic time. In the previous century, the population gradually declined due to persecution, egg and young collection, and pollution. The last breeding attempt in the 20th century occurred in 1972 in southeastern Denmark. No new breeding attempts were recorded in Denmark until 2001 but since then the population has gradually increased – most rapidly since 2012 – to a peak of 24 territorial pairs in 2018; some of them breeding on man-made structures (nest boxes at bridges and power plants). Here we update the information on the reestablishment of the Peregrine Falcon in Den-mark, including origin and dispersal, reproduction, and eggshell thinning.
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Andreasen, N. P. 2008. Genindvandring af Vandrefalk Falco peregrinus som dansk ynglefugl [The return of the Peregrine Falcon Falco peregrinus as a breeding bird in Denmark]. – Dansk Ornitologisk Forenings Tidsskrift 100: 309–218. (in Danish with English Summary)
Andreasen, N. P. 2009. Distribution and present status of the Peregrine Falcon (Falco p. peregrinus) in Denmark. – In: Sielicki, J. & Mizera, T (eds.) Peregrine Falcon populations – status and perspectives in the 21st century. – Turul, Warsaw and University of Life Sciences, Poznań, pp. 8–10.
Andreasen, N. P. 2012. I al sin vilde skønhed [In its wild beauty]. – DesignMark, Virum (in Danish)
Beran, V., Vrána, J. & Horal, D. 2018. Population trends and diversification of breeding habitats of Peregrine Falcon (Falco peregrinus) in the Czech Republic since 1990. – Ornis Hungarica 26(2): 121–129. DOI: 10.1515/orhu-2018-0020
Clum, N., Harrity, P. & Heck, W. 1996. Aging young Peregrines. – In: Cade, T. J., Enderson, J. H. & Linthicum, J. (eds.) Guide to Management of Peregrine Falcons at the Eyrie. – The Peregrine Fund: Boise, pp. 37–63.
Falk, K. & Møller, S. 1990. Clutch size effects on eggshell thickness in the Peregrine Falcon and European Kestrel. – Ornis Scandinavica 21: 265–269.
Falk, K., Møller, S., Rigét, F. F., Sørensen, P. B. & Vorkamp, K. 2018. Raptors are still affected by environmental pollutants: Greenlandic Peregrines will not have normal eggshell thickness until 2034. – Ornis Hungarica 26(2): 171–176. DOI: 10.1515/orhu-2018-0026
Falk, K., Møller, S. & Mattox, W. G. 2006. A long-term increase in eggshell thickness in Greenlandic Peregrine Falcons Falco peregrinus tundrius. – Science of Total Environment 355: 127–134. DOI: 10.1016/j.scitotenv.2005.02.024
Vorkamp, K., Falk, F., Møller, S., Rigét, F. F., Bossi, R. & Sørensen, P. B. 2017. New and updated time trends of persistent organic pollutants and their effects on eggs of Peregrine Falcons (Falco peregrinus) from South Green-land. – Aarhus University, DCE – Danish Centre for Environment and Energy, pp. 80, Scientific Report from DCE – Danish Centre for Environment and Energy No. 249 http://dce2.au.dk/pub/SR249.pdf
USFWS 2003. Monitoring plan for the American Peregrine Falcon, a species recovered under the endangered species act. – U.S. Fish and Wildlife Service, Divisions of Endangered Species and Migratory Birds and State Programs, Pacific Region, Portland, OR.
Wegner, P., Kleinstäuber, G., Baum, F. & Schilling, F. 2005. Long-term investigation of the degree of exposure of German Peregrine Falcons (Falco peregrinus) to damaging chemicals from the environment. – Journal of Ornithology 146(1): 34–54. DOI: 10.1007/s10336-004-0053-6