I live in Australia, which is famously full of animals that can kill you. This is of course exaggerated to folk lore status. However..there is one serious danger which should never be underestimated…..do not ever swim in rivers in the Top End. There are warning signs everywhere, They are usually a simple very obvious pictogram, but frequently look like this
Note the warning is written in English, German and I’ll say Chinese, but I’m not sure. In my travels round Australia I met a lot of German tourists, lovely people every one of them, but if anyone is going to cool off in a river on a hot day, despite warnings, it seems to be a German. This was the case as we were camped by a river in the Kimberley area, close to a group of German backpackers, and sure enough one went for a swim. He was fine, but I encouraged him to get out, and warned him about crocs. He was sure they only lived in the Northern Territory, and thought I was a panic merchant. The next morning there was a croc sunning on the opposite bank, and I pointed it out to him, and told him..”it (http://him….it) knows where you swim, and is waiting for you to go in again”. That’s why the signs are in German.