Board Thread:General Discussion/@comment-26200221-20151211162449/@comment-24152851-20160221124024

They're still very different from Ultimate Humgousaur's projectiles, which seem almost artificial. If I wasn't told he was an evolution I'd think he was was a cyborg.

Retractable jaws isn't that much of a long shot. Quite common in several species. Sharks could get their jaws stuck on something that isn't prey, as some of them are extreme omnivores that eat anything that remotely looks like food. And a shark with a functional mouth can mean life or death for it.

I guess. But I doubt having rocket launchers would make a significant life or death difference to Vaxasaurians. There's so little that can kill them already.

Actually I'm not talking about energy available in the environment, I'm talking about a creature assigning energy expenditure in their own body. One of the rules of evolution is "use it or loose it", anything which isn't needed will recede over time and become vestigial (like out tail bone or appendix). There has to be a very significant life or death need for the arm cannons for them to sustain. Not saying there isn't a reason, maybe there's a flying predator that preys on Vaxasaurians, but it's still quite unlikely.