World's Most Rodent-Packed Island Has Just 2 Options
Blanket island in poison, or deal with the 60K mice
By Kate Seamons, Newser Staff
Posted Aug 18, 2013 11:27 AM CDT
In this photo taken Thursday Oct. 13, 2011, shown is Southeast Farallon Island at the Farallones National Wildlife Refuge, Calif.   (AP Photo/Eric Risberg)

(Newser) – Those suffering from musophobia would be wise to steer clear of the South Farallon Islands. The archipelago, which sits just 27 miles off San Francisco, is the most rodent-dense island in the world, with an average of 500 Eurasian house mice occupying each of its 120 acres (that's 60,000 total). The only humans who have to deal with them are the scientists studying the otherwise uninhabited island's unique ecosystem—and things have gotten so bad that they say the ground often seems to be moving, and other species are being threatened. On Friday, the Fish & Wildlife Service released a 650-page report that sums up its review of the 49 methods suggested for getting rid of the creatures, which are believed to have made their way to the islands via 19th-century seal-hunting vessels. It determined there are only two options: One, douse the island with rodenticides. Two, do nothing.

Though other ideas included carting in feral cats, trapping, and sterilization, the Fish & Wildlife Service say that any method other than poison—which would entail food pellets treated with one of two anticoagulants being dropped on the island, ultimately causing the mice to bleed to death—would have too great an effect on the ecosystem. But the effort wouldn't be as simple as just dropping and waiting, explains the SF Chronicle: peregrine falcons and burrowing owls would have to be captured and held elsewhere; methods would have to be put in place to deter sea gulls. And while mice have been wiped from more than 50 islands around the globe using rodenticides, animal rights groups are staunchly opposed, and note that in the aforementioned cases, other species also perished; KTVU also notes that products made with one of the poisons under consideration were banned from sale this year by the EPA because they are so toxic to animals. But biologists say that even with those casualties, the ecosystems have bounced back. A decision is expected by year-end. (Click for a more disturbing story involving tens of thousands of rodents.)

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Showing 3 of 135 comments
Aug 20, 2013 9:38 AM CDT
average cat has 97 kills per year when allowed to raom outside per research. 10 cats would kill and round up to 1000 kills per year. so 100 cats would be good and the eproblem will go away in a few years. yes maine coons are the best! they go to town.
Aug 20, 2013 12:48 AM CDT
bring a few kitties
Aug 19, 2013 6:28 PM CDT
Trap them and sell them to merchants in rural China. They roast, fry, and stew them. I know this sounds harsh but a protein is a protein over there, it does not matter ,its usable nutrient. They could even offer to let some of the merchants set up shop and then cook the mice on location and then can the meat and send it back to the small towns from where they came. China gives a rice allotment to all citizens much like our own USDA food programs. You just have to be in good standing with the party. I imagine that by the time mouse meat has been seasoned and stewed, you would think its just any kind of roast here in the USA. There really is not anything wrong with it as I imagine pigs to have worse hygiene.