And here's why...
A study by Elton (1953) certainly indicates that cats are not always successful at keeping rats on farms under control. Most cats do hunt mice, but if your cat is strictly an outdoor cat, how do you know he isn't hunting on someone else's property? How can a cat keep your home free of mice if he's never there? It is actually possible that indoor cats may control some insects and mice inside the home. That would make an excellent study!
Elton, C.S. 1953. The use of cats in farm rat control.
British Journal of Animal Behaviour 1:16
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