Ciaran. Please check the GPS provided location of this sighting . This present location across the river on the north bank, from ca. halfway along the entrance road before the National Park, in steep river bank dense forest, looks odd for this occasional weed alien tree and garden species, for your before and after sightings, and in the bottom of these photographs I can see the paved pathway and edging materials familiar to me in the Mossman Gorge National Park picnic area, at about: -16.472142, 145.331306 .