User blog comment:BannedLagiacrus/Monster Appreciation Week: Molten Tigrex/@comment-4702773-20160124053148/@comment-5963861-20160124150040

What I'm saying is that scientists believe many dinosaurs were able to grow so massive is because like birds they had specialized air-sacs in their bones. This is probably why so many wyvern/draconian monsters in MH are so dang massive.