Anser cygnoid
System : Freshwater_terrestrial
Kingdom
Phylum
Class
Order
Family
Animalia
Chordata
Aves
Anseriformes
Anatidae
  • Not Evaluated
    NE
  • No Alien Population
    NA
  • Data Deficient
    DD
  • Minimal Concern
    MC
  • Minor
    MN
  • Moderate
    MO
  • Major
    MR
  • Massive
    MV
  • General
  • Distribution
  • Impact
  • Management
  • Bibliography
  • Contact
Common name
 
Synonym
Similar species
Summary

Principal source:

Compiler:

Review:

Publication date:

Recommended citation: Global Invasive Species Database (2025) Species profile: Anser cygnoid. Downloaded from http://iucngisd.org/gisd/speciesname/Anser+cygnoid on 14-01-2025.

Countries (or multi-country features) with distribution records for Anser cygnoid
ALIEN RANGE
NATIVE RANGE
Informations on Anser cygnoid has been recorded for the following locations. Click on the name for additional informations.
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Location Status Invasiveness Occurrence Source
Details of Anser cygnoid in information
Status
Invasiveness
Arrival date
Occurrence
Source
Introduction
Species notes for this location
Location note
Management notes for this location
Impact
Mechanism:
Outcome:
Ecosystem services:
Impact information
Red List assessed species 3: LC = 3;
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Management information
Bibliography
4 references found for Anser cygnoid

Management information
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).
General information
Contact
The following 0 contacts offer information an advice on Anser cygnoid
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).