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Sour crop and slow crop are indeed often related tosomething elsewhere in the digestive tract. Impacted crop, however, is usually not--something is in the crop that has blocked it. Common things are excessive amounts of long blades of grass (a reason to NOT give grass clippings; much better to let them bite off small pieces), excessive amounts of grit, sand or rocks. Any of these can block the exit from the crop, causing everything else to form a massive traffic jam, so to speak.
You mentioned earlier that this bird likes to eat wood shavings--that could very well cause a crop impaction.
Sour crop and slow crop are indeed often related tosomething elsewhere in the digestive tract. Impacted crop, however, is usually not--something is in the crop that has blocked it. Common things are excessive amounts of long blades of grass (a reason to NOT give grass clippings; much better to let them bite off small pieces), excessive amounts of grit, sand or rocks. Any of these can block the exit from the crop, causing everything else to form a massive traffic jam, so to speak.
You mentioned earlier that this bird likes to eat wood shavings--that could very well cause a crop impaction.