If birds poop everywhere and don't hold it, then how come bird Pokémon never shit in-battle? I mean, at least the anime and the games don't show it. Wouldn't it be funny if while Staraptor was using Close Combat it left a big string of hawk shit on the opponent? Just imagine the foe being punched and pecked and kicked while being covered in feces! Hehe
Now what if say, Talonflame, was using Brave Bird while shitting? Would it be like a stunt plane doing aerobatics? That would be so weird!