The water dragons are beneficial to the crocs and generally left alone (if not welcomed), march flies can bite crocs only in the nostril and they do feel it! the dragons usually hunt the flies, running up and down the croc. its sort of like cleaner wrasse and large fish, the dragons help the crocs and in turn they are left alone. There was a nest full of swamp hens in Weipas fencline and when people walk past they would seek 'refuge' in Weipas water...
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