Strange Pooping Patterns?

BEIRUT!

New member
Hey, I have a 1.5-2 year old European Goldfinch (Male).
Sometimes he will have poop that has mostly white but a little black, I think that's normal.
Other times he will poop greenish, and a little white.
What does this mean?
I don't think he's sick, because he is always playing with his toys, always singing even throughout the molt, and he seems to be a very happy little birdie.
What could be wrong?
 
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