A plague of house mice is wrecking the ecosystem of the beautiful Farallon Islands of California, according to new research.
The tiny rodents are eating their way through native insects, seabirds and plants that are not found anywhere else.
The mice were introduced to the Farallon Islands, 30 miles off San Francisco, by 19th-century sailors. The population has since soared to about 50,000, inhabiting an area roughly the size of two football fields.
