User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-69.140.237.23-20120208182652/@comment-1011548-20120208213129

Normal Ludroth couldn't rest in Area 12 of the D. Island in P3, what with there being no water areas, so I'm guessing Poison Ludroth just rests wherever it rested (Area 10?). And look at the Royal Ludroth Subspecies page, the screenshot shows it can definitely be found in the D. Island still. It also turns up in the Mountain Stream... and I'm not sure about the FF.