1 Zoology A small stone swallowed by a bird, reptile, or fish to aid digestion in the gizzard.
- One of the avian characteristics of the emus is that they also eat small stones (called gastroliths or gizzard stones).
- The presence of gastroliths (gizzard stones) in the rib cages of some specimens shows that this view is correct.
- Such stomach stones or gastroliths have been reported from the gut regions or found nearby of prosauropods, sauropods and ornithopods.
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