A warming island's mice are breeding out of control and eating seabirds. An extermination is planned

This undated handout photo shows a house mouse on Marion Island, South Africa. Mice that were brought by mistake to a remote island near Antarctica 200 years ago are breeding out of control because of climate change, eating seabirds and causing major harm in a special nature reserve with “unique biodiversity.” Now conservationists are planning a mass extermination using helicopters and hundreds of tons of rodent poison.

The Mouse-Free Marion project — pest control on a grand scale — is seen as critical for the ecology of the uninhabited South African territory and the wider Southern Ocean. It would be the largest eradication of its kind if it succeeds. “They are probably one of the most successful animals in the world. They’ve got to all sorts of places,” Wolfaardt said. But now on Marion Island, “their breeding season has been extended, and this has resulted in a massive increase in the densities of mice.”

A single mouse will feed on a bird several times its size. Conservationists snapped a photo of one perched on the bloodied head of a wandering albatross chick.The scale and frequency of mice preying on seabirds on Marion has risen alarmingly, Wolfaardt said, after the first reports of it in 2003. He said the birds have not developed the defense mechanisms to protect themselves against these unfamiliar predators and often sit there while mice nibble away at them.

Wolfaardt said four to six helicopters will likely be used to drop up to 550 tons of rodenticide bait across the island. Pilots will be given exact flight lines and Wolfaardt’s team will be able to track the drop using GPS mapping. The eradication project is a partnership between BirdLife South Africa and the national Department of Forestry, Fisheries and the Environment, which designated Marion Island as a special nature reserve with the highest level of environmental protection. It has a weather and research station but is otherwise uninhabited and dedicated to conservation.

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A warming island's mice are breeding out of control and eating seabirds. An extermination is plannedMice that were accidentally introduced to a remote island near Antarctica 200 years ago are breeding out of control because of climate change
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