User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4775842-20120813183201/@comment-4674269-20120813221247

I don't believe Guran's semi-aquatic was an evolutionary choice, but rather a forced lifestyle. We agree that Guran's body is VERY VERY Hot, but not like Lunastra and Teostra where they produce external heat, Guran's heat is deeply internal inside it's own body. I feel what exactly that molten looking fluid that flows through out its body ( Is it lava, blood, etc.) should be left for another discussion, but it must be extremely painful and dangerous to the body. While other monsters have adapted to lava living life styles (Gravios, Lavasioth, Agnaktor, Etc.), they have very well adaped shells to keep it outside their bodies and can very well leave the lava, Guran on the has a similar hot substance in it's body and must walk around with it forever.

While Elder Dragons have impressed us before, I highly doubt any living creature could sustain life with such a hot internal system... on land that is. Guran's aquatic lifestyle is probably due to the fact that it the water cools down its body, allowing it to keep it's greatest weapon and still survive. While Guran can still walk on land, it still must return to the water after a certain amount of time or risk over heating (as seen during it's battle).

While volcanic waters may not seem like the best place to "cool down", but too cold of waters may also be dangerous plus the rare minerals and ores in the volcano are probably needed to form Guran's meteors.