Assertion: cockatiel's food | /r/Causes | the color
Facets:
Source sentences:
text: If the cockatiel’s poop is reddish or dark brown to black and your avian chum has not eaten food that could have caused the color, then blood could be responsible for the discoloration.
text: and your avian chum has not eaten food that could have caused the color, then blood could be responsible for the discoloration.