It's Australia. EVERYTHING tries to kill you in Australia.
He might have checked the website "Pro Tips: Australia", and he would have noticed that... 
It is interesting that the kid was probably inundated by shows like Fear Factor, or Survivor, or Bear Gryllis, or whatever, where people are eating tons of gross stuff. I didn’t know slugs carried a particular deadly worm. I’d been trained that there’re many grubs and larvae you could eat, if you need to. (I know this is not the same...!)
It's Australia. EVERYTHING tries to kill you in Australia.
He might have checked the website "Pro Tips: Australia", and he would have noticed that...