If more cats are abandoned, run off or reproduce in the «wild,» might they not set up yet another population separate from existing colonies? (abqjournal.com)
[FN30] Because cats are not strictly territorial, new ones are freely allowed to join existing colonies. (animallaw.info)
There is a solution that not only reduces the feral cat population, but also improves and extends the lives of existing colony members: TNR. (meowcatrescue.org)