User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5043481-20130330104457/@comment-7584137-20130330105220

Hmm.... maybe Brachydio´s saliva has evolved alongside the rest of it´s body? Capcom has said that the reason they came up with Brachydios was to make a Brute Wyvern that would actually use it´s arms and not just charging attacks. So because Brachy´s main weapon is it´s arms, it has evolved accordingly. On it´s saliva runs a special bacteria that when it cames in contact with it´s slime-covered arms, it covers the arms with slime again (I´m sure you have noticed that it frequently licks it´s arms while in battle to restore the slime) and that slime is prone to explosion when Brachi strikes his arms to the ground. All of this is thanks to it´s saliva, that no other monster has: a special bacteria that when mixed in the slime, causes said slime to be prone to explosions. That´s the best I can come up with right now.