>>5010718
They absolutely can establish themselves as pests just about anywhere, Australia has a major feral cat problem. Even the regions surrounding African villages have feral cat colonies right alongside native African wildlife; conservation groups worry about the African wildcat (the wild precursor to modern domestic cats, picrel is an African wildcat) because they can interbreed with feral domestics and pollute their gene pool. I love cats but for fucks sake, keep them indoors.