User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4563270-20130205164110/@comment-5963861-20130208012437

You could also ask the question why Gravios travel to swamps ? The creatures are going there for reasons that we may not understand but the fact is that they're there. The idea of the creatures occasionally traveling there to take advantage of plentiful food and temperate climate is pretty much the best one. Also I'm pretty sure Diablos/Barroth would have little to no problems burrowing around in the soil seeing as the two Lavasioth in the Tower can burrow through solid rock. On the subject of the Kut-Ku I'm sure they occupy the same niche as the common Kut-Ku would also scavenge and eat meat.