User blog comment:Lord Loss/Monster Hunter Frontier Season Forward 5/@comment-4081776-20120929001646/@comment-429226-20120930091413

In my opinion the "cannon" on Odeibatorasu carapace could be a special salt gland blow hole. The salt gland helps by extracting extra salt and sand from its body at a massive rate by firing the mass out of its body resembling a "cannonball".

Marine iguanas use nasal glands(salt glands) to filter its blood for excess salt ingested while eating, which is expelled(sneezing) through the nostrils.