Management of Introduced Corellas

 

Management of Introduced Corellas

Introduced corellas are becoming an increasing problem on the Swan Coastal Plain, including the Bunbury area, through nuisance and impacts on infrastructure.

In view of this, the Little Corella (Cacatua sanguinea sanguinea), was recently declared as a Category Three Declared Pest in Bunbury and the surrounding shires under the WA Biosecurity and Agriculture Management Act 2007 (BAM Act).  This declaration requires land holders to undertake measures to reduce the impact of the pest and reduce its distribution.

The corellas in question are not native to the south west of Western Australia, including the Bunbury Region.  It is understood that these birds originated through escape or deliberate release from aviaries and the population has expanded through subsequent breeding in the wild.  A small flock of introduced corellas was first observed in Bunbury in the mid 1990’s.  Favourable conditions including abundant food (e.g. pasture, irrigated turf) and water has seen this flock increase in size to approximately 1,000 birds in 2018.  The population is currently causing significant impacts on the community including disruption of sleep due to noise at roosting sites, damage to infrastructure and trees due to their chewing behaviours and fouling.  Without management intervention it is expected that the local introduced corella population and its associated impacts will increase.

 

What we are doing

The community of Bunbury first appealed to the City for assistance with the problem in 2010 due to ongoing sleep disruption at a roost site at Horseshoe Lake, East Bunbury.  Since this time, the City has undertaken a range of activities in response, including participation in several collaborative initiatives with other local governments and state government agencies and the creation of an ongoing local control program.

At present (February 2020), the City’s focus is upon the continuation of efforts to minimise the adverse impacts caused by introduced corellas within Bunbury.  This is primarily being undertaken via culling by an experienced pest contractor.

Despite the considerable efforts undertaken by the City and other key stakeholders to date, eradication of the introduced corellas appears unlikely in the short to medium term due, inter alia, to the size and distribution of the introduced corella population in the south west.  As such, management of the birds is likely to be an ongoing issue for foreseeable future.

The City will continue to refine and improve its management of the introduced corellas into the future in order to minimise their impact on the local community.  However, it must be recognised that the introduced corellas, along with many other pest species, pose a significant problem, one that extends beyond local government boundaries, resource availability and statutory responsibilities.  As such, introduced corella management requires a shared response across all stakeholders including government, the private sector and community, where appropriate.​

More information

To view the Introduced Corella Management Strategy that was noted by Council click here.

For further information on the issue of introduced Corella in the City of Bunbury click here

Click here for further information on corellas and other flocking cockatoos.

What you can do to help

Community members can assist with the issue by refraining from feeding the introduced corellas and by taking a responsible approach to domestic corella keeping (i.e. ensuring that the birds to not escape to the wild).

Information, enquiries or complaints related to this issue can be lodged via email to records@bunbury.wa.gov.au