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Re: Gastroliths in Chinese theropods

In a message dated 97-12-17 18:18:17 EST, th81@umail.umd.edu writes:

<< Gastroliths are a primitive archosaurian feature: birds have'm, crocs
 have'm, and by using phylogenetic bracketing, all other archosaurs probably
 had them.  It is no more an aquatic feature than is the antorbital fenestra!

In modern flying birds, gastroliths help to grind up and digest the birdseed
they consume. I understand caged birds become very agitated when they're not
allowed to have tiny stones in their diets.