Re: Gastric stones of dinosaurs were not for milling food !

[Dann Pigdon <dannj@alphalink.com.au>]

John Scanlon writes: 

> Take-home message: no evidence for a gizzard in non-avians, and incidental
> ingestion may explain all other cases of gastroliths (including in
> crocodilians).

Surely gastroliths in living crocs are well studied? Crocs will go out of 
their way to collect stones from specific sources, sometimes well outside of 
their usual territories. 

Or does the paper suggest that croc gastroliths are purely for buoyancy 
purposes and have little to do with digestion? If so, then why are they so 
picky about the types of stones they ingest? 

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Dann Pigdon
GIS / Archaeologist         http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://heretichides.soffiles.com
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