Q: for the evidence for parental care at nest sites, I don't understand why crushed eggshells is an indicator of parental care, couldn't the eggs be crushed by other critters (since they were laid on the ground) or by natural disasters?
A: good point, but I guess if everything else about the nest is intact (and there are baby dinosaurs in the nest) then it's assumed to be the baby dinosaurs who crushed the egg shells. It shows that these babies were not just hatched when the disaster (whatever it was) quickly buried them.
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