A 2003 study in the journal Mammal Review (view it as a PDF) suggested that cats predate 5 million reptiles and amphibians, 27 million birds and 57 million mammals in the UK each year.
In the US, some estimates say 100 million birds are killed by cats each year (a Forest Service report by Erickson et al in 2005) and “more than a billion small mammals”, according to a study published this year by the American Bird Conservancy (view it as a PDF).
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