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RE: Protoceratops forelimbs

The work I and Christiansen have published on ceratopsian arms in 
Paleobiology found that they are remarkably similar albeit not identical in 
form regardless of size from Leptoceratops to Triceratops, and should have 
shared the same posture. Lacking good trackways from a wide variety of sizes 
and taxa cannot say much about any differences that existed.