Something just occured to me; What if there is some sort of general language that is shared amongst all creatures in the LBT universe? Kind of like in either Watership Down or Redwall (They're not that similar, but I can't remember which one used this) where there was a "hedge" language that all animals could use to communicate with others. :! So there would be flatteeth, sharpteeth, and mammal languages for the terrestrial creatures, then flyer and underwater creature languages, but then one separate language that everyone could use.
Also, I have to give my opinion that Rinkus and Sierra are sharptooth flyers. It is true that in real life Pteranodon was probably a fish eater, but in LBT universe crested flyers have always been shown as leaf eaters (AFAIK). But since we never see R & S actually eat anything, I guess we'll never know for sure.
Considering the inaudible screeching on the sharptooth flyer in the fifth movie, I think different languages apply for sharptooth and leaf eater flyers, and that Rinkus and Sierra were leaf eaters, as, unlike the LBT 5 sharptooth, they never attempted to eat the gang.
Ducky would have been eaten if they were sharpteeth flyers
Besides, if they were indeed sharpteeth, Sierra would have suggested to Pterano that he and Rinkus should eat the young ones rather than feed them to sharpteeth.
Well, for one thing, I heard Rinkus and Sierra both screeching several times while trying to capture Ducky in the canyon, and Sierra did try to bite Ducky when he swooped down at her, showing off some very sharp looking teeth. Another thing is that by the time the flyer trio had to camp out in the cave they had already had several harrowing encounters with the gang, and Sierra was probably just tired of being around them and wanted them disposed of quickly, via traditional sharpteeth. As for why they didn't try to eat them at first, well, Pterano would have very much disapproved, since he was trying to gain the gang's trust, but maybe it's just that R & S don't like the taste of hatchling.
