so i have 9 mnth old female cockatiel about an hour ago i noticed that her poop is like a greenish brown then it started to get light brown with white liquid (the thing that comes out with the reg. poop) so im worried i dont know if it is ok that she is pooping this color so if you know plz answer. is it bad for her poop to be brown? if it is why is she pooping brown poop?