User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4212769-20120302173919/@comment-4212769-20120303074924

It's not much a disadvantage if the monster is large enough to avoid attacks. And not when the limbs are small enough to grip them. The offspring would be a problem but when the parents defend them till they are big enough it would work. But I think you're right.

Maybe not Leviathans but I don't think Herbivores as well because they have another leg structure. And I think most of the Wyverns are carnivores so it would easier to evolve from a carnivore as well. Another thing you don't know if the first Leviathans are specialized like the ones in MH.

But what do you think how a third pair of limbs can be formed? I've got no idea but that.