What about the snakes that grow to 50 feet long and can crush a troopy with a load of backpackers..
I knew somebody that said they met someone who heard a rumour about that. 
Also consider this... 
Crocs have been spotted in Maryborough. Parks and Wildlife failed to catch it/ them. 
(Google it... No BS..)
Crocs as a rule are north...
Umm about half of Fraser is north of Maryborough. 
There is now a croc warning sign at the northern tip of Fraser... And on the park maps. 
Maybe they have been eating dingos?
Just food for thought. 
Add crocs to the list. And I haven't been mentioned the huge sharks I have seen caught off the beach. 
Not a safe place at all...
Stay away.