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A peer-reviewed article of this Preprint also exists.
This is a unique and interesting Preprint! I am especially interested in the authors' idea of using injuries to interpret a gregarious lifestyle. Are there any ecological studies of the few gregarious extant predatory archosaurs (Harris' Hawks, for example) that would support this conclusion? Has this "nursing" behavior been demonstrated for any extant taxa outside of archosauria? I see the logic behind it but without any modern data is it also possible that this individual simply followed other successful predators? Certainly the animal survived and healed from its wounds but it does not necessarily follow that its conspecifics nursed it back to health. Given what we know about intraspecific conflict in theropods it is equally likely the left side injuries were caused by a conflict with another Allosaurus. I think more work needs to be done to show that the "caring pack" hypothesis proposed here is supported by the fossil and modern ecological records.