User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4563270-20130205164110/@comment-4212769-20130206184526

It seems everybody forgets something. There's also competition. It doesn't only matter if they are able to live there or not, they have also other monsters that fill the same niche there they have to compete with.

While Gobul, Volvidon and Duramboros can live there, other monsters would be outcompeted by monsters better adapted to this environment. Barroth is argueably ok, though I don't think it would go to a place that moist.

Great Baggi and Great Froggi have to compete with Great Jaggi, much better suited for this area. Crimson Qurupeco has to compete with the normal Qurupeco but is better suited for hotter areas that aren't too dry. Diablos is too adapted to the Desert and surely would be effected by the much higher moisture.

And comparing monsters with others only because they have similarities and say it has to apply, is ridiculous. Great Baggi is not like Giaprey simply put as it is better adapted to the cold than Giaprey as Giaprey also live at the foot of the Snowy Mountains not only in the very cold areas. Also who knows how much way there is between the Tundra and the Deserted Island. And it is probably too moist for it too. Gravios may be able to go to the Swamps but that doesn't mean Uragaan can automatically go to another climate too. Also there is a great lack of ore and plants it could simply eat in the Volcano too. So why take this arduous journey if there is hardly much better, actually even worse, than in the Volcano.

Also, good conditions are relative. What first seems like good conditions could be bad for animals/monster adapted to different environments.

@Dracosaurian: How is this fact? There aren't any quests with them and they don't appear when you go to this place in a quest. Why don't they?

I will agree with Dax on this that this is the work of some idiot, releasing them in the Deserted Island or coming there by coincidence.

Another theory could be that those are subspecies of the normal monsters found in the usual environment, living at the Deserted Island although in some cases hard to see. In some cases it looks pretty unlikely though. :/