"You can't blame the cats, as has been said it's their instinct. You just have to realize that every bird brood will loose young at some time. It's a rare event for a full brood to survive."
No you can blame irresponsible cat owners who allow cats to roam where they please killing wildlife. Domestic cats are not a predator that occurs naturally in the UK their numbers are way in excess of those that natural predators can sustain and are not regulated by predator/prey relationships as domestic cats are fed by their owners - work carried out by the mammal socvietry shows that cats have a hugely detrimental effect on British wildlife.
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Based on the proportion of cats bringing home at least one prey item and the back-transformed means, a British population of approximately 9 million cats was estimated to have brought home in the order of 92 (85-100) million prey items in the period of this survey, including 57 (52-63) million mammals, 27 (25-29) million birds and 5 (4-6) million reptiles and amphibians.
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Some US cities are now making illegal to allow cats to roam free off of the owners property in order to protect wildlife.