Recommended citation: Global Invasive Species Database (2025) Species profile: Anser cygnoid. Downloaded from http://iucngisd.org/gisd/speciesname/Anser+cygnoid on 14-01-2025.
Gebhardt H (1996) Ecological and economic consequences of introductions of exotic wildlife (birds and mammals) in Germany. Wildlife Biology, 2, 205 - 211.
Randler C (2004) Aggressive interactions in Swan Geese Anser cygnoides and their hybrids. Acta Ornithologica, 39(2), pp.147-153(7).
Geiter O, Homma S and Kinzelbach R (2002) Bestandsaufnahme und Bewertung von Neozoen in Deutschland, Umweltbundesamt.
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MN
Anser cygnoid
Date assessed
2021-10-15
Year published
2023
Eicat category
MN (Minor)
Justification for EICAT assessment
There are reports of Swan Geese hybridizing with Greylag Geese (Anser anser) in Europe in the wild. There is no evidence that this has caused a decline of Greylag Geese (Gebhardt 1996, Geiter et al. 2002, Randler 2004, Banks 2008).
Confidence rating
Low
Mechanism(s) of maximum impact
Hybridisation
Countries of most severe impact
Germany; Netherlands; United Kingdom; Italy
Description of impacts
The Swan Goose hybridizes with the Greylag Goose in Europe and shows aggressive behavior towards native birds.
Assessor
Thomas Evans; Tom Allmert
Contributors
Reviewers
EICAT authority
Recommended citation
Thomas Evans, Tom Allmert (2025). Anser cygnoid. IUCN Environmental Impact Classification for Alien Taxa (EICAT).