You’re a bit confused, smallcoder. Spiders don’t like hot weather. They come inside when it’s cold and damp. Snakes might be happily breeding, but not in the cities. As for the “water creatures,” by which I assume you mean crocodiles, they might be found in rivers in the Northern Territory, but not at (for example) Bondi Beach. I live in the south, and I can assure you I have no problems with snakes, spiders or “water creatures,” unless you count oysters, which I sometimes eat.