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4th trochanter

I have another question!
Why is it that in some ornithopods the 4th trochanter
is long, slender and hook-shaped (e.g. in Dryosaurus)
and in others robust and stretched along the shaft
margin (e.g. in Hadrosaurs)? I know it must have
something to do with the musculus caudofemoralis, but

Thank you,


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