basically birds often use their bills to do things which other animals do with their limbs, tail, etc. for example, the toucan uses its bill to reach fruit and eggs on thin branches, while a monkey uses it's hands, I'm saying that while it would be useful, it would be odd for the average run of the mill nicheling to unlock a beak like that even though it, birds had wings for a long time in their evolutionary history, and their beaks/feet(in the case of parrots and raptors) serve to work around the limitations wings have versus say, arms