In 1949, five domestic cats were brought to Marion Island to control mice; their population grew to about 2,000 and was estimated to kill 450,000 seabirds a year

The introduction of feral cats to Marion Island aimed at controlling mouse populations inadvertently led to a steep decline in native bird species. Conservationists launched a dedicated eradication program, successfully removing the last cat in 1991. Despite this victory, house mice continue to pose a significant threat, prompting a new initiative for aerial baiting scheduled for 2027 to address this ongoing issue.
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