[slug]

Unfortunately cats don't eat only rats, they also like birds for instance. Look at the dodo extension mentioned in another thread, domestic animals played an important role there. Then the birds usually keep (nasty) insects population in control, etc and keeping a balance is tricky.

Snakes or other crawling rat predators would probably be a better idea, but then trying to convince the island people to share their space with snakes and weird looking insects at the same time would probably not go well :)

[nazar]

Snakes have bad impact on birds as well. Maybe not adults, but the eggs. I believe there is always a bigger fish in the ocean, everything is just a matter of equilibrium and its rules of self-control. Humans and rats probably are the only species that ignore those rules.