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The function of gastroliths

Ornithomimosaurs, oviraptorosaurs (at least *Caudipteryx*): Instead of chewing, 
as in birds.

Sauropods: Not.


I don't have access; I found out via this science news service 
http://www.wissenschaft.de/wissen/news/273108.html (in German) which mentions 
that sauropods may have _actually eaten_ stones for minerals.

You'll recognize the authors.
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