Er...hmmm. Good question. Honestly, I don't know lol. ^^; Not all information has to be interpreted into the game I guess. If that were the case, Swordbeaks could be black, silver, green, etc. Or as Sarzael puts it: xD
This is an awesome mount/mob suggestion. I would love to see this in-game. And indeed, this reminds me of the Chocobo in Final Fantasy, but still this is unique enough.
...My GOD THIS IS EPIC! ...This is just... ...It just feels so... ...Please do a Bluntbeak, it would have same kind of beak as the knifelet, but bigger and badder
The greatness of this suggestion is unrivaled. If one suggestion could be in the game, I could only hope it is this one.
I would hate to have to fight one of these birds, bet they could cleave through armor like it was butter, but man they look awesome!