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I took them in from their den all at once.

Yeah that is what we did. And then a month later we found two more giving us 7 total. We'ed take the feral mama cats in but they run from us. They are wild! Several of these outside cats are. Most of them have been fixed. The ones that aren't is because we can't catch them.

You are doing a good job. Just imagine how bad things would have been if you made no effort to control them multiplying.