It depends on where you live. Here, it is necessary to have barn cats. It is probably different in the suburbs.
Cat story- I once lived on an island, which was mostly abandoned, but had once been populated and farmed. There were lots of chickens and cats left over, and roaming the jungle and the plantation ruins. An ecological study was commissioned, it was decided that the cats were inhibiting the native bird population, and the solution was to trap and kill the cats. This was accomplished expensively. The unsurprising result was that the rat population exploded. Rats were another species that had been introduced, but had not been previously considered a danger to the birds, because there had never been very many of them. The rats turned out to be much more of a threat to the birds than the cats ever were. And for the people on the island as well. The cats would purr at you and beg for scraps when you were eating BBQ on the beach. The rats, on the other hand, attacked people in their sleep.
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