A small metal sphere was placed in the crop, so it would be come "stuck" in the ventriculus. They administered various things to see which would help the sphere pass fastest (psyllium with grit, acidic drinking water, fine grit, coarse grit, cathartic emollients [peanut butter and mineral oil].
And guess what? Grit worked fastest.
(Journal of Avian Medicine and Surgery 23(3):186–193, 200)
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