Yes, there are. There are stray and feral domestic cats everywhere humans can live comfortably.
And no, that thread does not explain anything. I stopped participating in sophomoric bullsessions about thirty years ago, when I was a sophomore.
Cite: Fijian ground frogs are threatened by feral cats:
http://www.naturefiji.org/endspecies.php?info=Fijian%20Ground%20Frog