Recommended citation: Global Invasive Species Database (2025) Species profile: Cacatua galerita. Downloaded from http://iucngisd.org/gisd/speciesname/Cacatua+galerita on 05-02-2025.
Costion CM, Kitalong AH, Perlman S and Edwards W (2013) Palau’s rare and threatened palm Ponapea palauensis (Arecaceae): Population density, distribution, and threat assessment. Pac. Sci. 67:599 - 608.
Loope,LL, Howarth FG, Kraus F and Pratt TK (2001) Newly emergent and future threats of alien species to pacific birds and ecosystems. Studies in Avian Biology 22:291-304.
Runde DE, Pitt WC & Foster JT (2007) Population ecology and some potential impacts of emerging populations of exotic parrots. Manag. Vertebr. Invasive Species. Pap. 42. 42.
Styche A (2000) Distribution and behavioural ecology of the sulphur-crested cockatoo (Cacatua galerita L.) in New Zealand. Unpublished. Victoria University of Wellington, New Zealand.
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MO
Cacatua galerita
Date assessed
2021-10-22
Year published
2023
Eicat category
MO (Moderate)
Justification for EICAT assessment
The Sulphur-crested Cockatoo was documented killing entire trees of Hydriastele palauensis by feeding on the terminal bud or "palm heart", causing the decline of this species. However, Hydriastele palauensis can be found throughout the limestone islands and today is common, lending some doubt to claims that it was once widespread, but has declined due to parrot predation (Costion et al., 2013).
Confidence rating
Low
Mechanism(s) of maximum impact
Grazing/herbivory/browsing
Countries of most severe impact
Republic of Palau
Description of impacts
The Sulphur-crested Cockatoo feeds on native invertebrate and plant species in New Zealand. It is believed to have caused the decline of a native palm species on Palau. To date it has a neglible competition impact on native bird species.
Assessor
Thomas Evans; Tom Allmert
Contributors
Reviewers
EICAT authority
Recommended citation
Thomas Evans, Tom Allmert (2025). Cacatua galerita. IUCN Environmental Impact Classification for Alien Taxa (EICAT).