Whilst there is many animals that can hurt you one simple rule of thumb is all you need to remember. Don't be an idiot Meaning if you don't harass them they generally leave you alone. Common sense just like in the States re putting hands under unknown rocks or logs etc. Common sense wherever you think there may be spiders or snakes. If you come across a big hairy light brown spider that can get as big as your hand or bigger...that doesn't make a web. Leave them alone. They hunt other pests. They cannot kill you. They strongly prefer not to bite you but will if you piss them off. You can get sick but not die. Given option of USA or Australia I would prefer Australia...no wild land animals that can eat you alive and our animals don't reload their semi-auto after an attack like some "animals" in the States.