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2) Small theropods are apparently found w/ bone preserved in the gut
Four times is not "rather frequently", is it? Can we do meaningful
statistics with such small sample sizes?
Importantly, preserved gut contents other than bone are just about never
preserved. Likewise, coprolites don't seem to contain anything
identifiable other than bone, pollen/spores and/or phytoliths.
3) Large theropods are apparently [...] NOT found w/ large bones
preserved in the gut, but some smaller bones are known (e.g.,
fishbones in Baryonyx).
Correct. IIRC, there's also an iguanodontian vertebra in *Baryonyx*.
A relevant question is: have small bones been found in the gut
regions of Cretaceouc crocodilians? If the answer "no", then I would
think the presence of small bones in various theropod guts are a
indication (albeit counter-intuitive) of a primarily predatory
Why? Crocodiles have legendary stomach acids.
The argument against terrestrial obligatory scavengers remains the one
from that lifestyle being a net loss of energy.