Same reason you don't walk in strangers' doors. 'cept birds are less likely to have guns or large knives.
Well, birds' beaks are nothing to trifle with. A parrot, for example, will take your fingers clean off if you're foolish to put them where it doesn't want them. Even little birds like these could easily put out an eye with their beaks or talons.
Thus why I put "large" in there; they do have small ones.
Akagi! Prepare yourself!Geez!
I don't know what's going on anymore!!
(Fubuki)For a practice, there's some rather uncivilized yelling..Huh? Nagato-san, Is that practice...?KONGOU!
KIRISHIMAA!
Become algae in the sea!Wo?DIE!!