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[dinosaur] Mysterious daspletosaurus deaths

Good day,

I would like to ask listmembers if there is any probable explanation for the deaths of three _Daspletosaurus torosus_(or _Daspletosaurus sp._?) specimens found in the sediments of the Two Medicine formation in Montana? These age-varied specimens were found in association with at least five hadrosaurid individuals on which they were feasting prior to their deaths. According to wikipedia "Geologic evidence indicates that the remains were not brought together by river currents but that all of the animals were buried simultaneously at the same location." The cause of death of daspletosaurs is therefore unknown. What could possibly kill three large theropods (although only one individual was an adult) in one place? Thank you in advance, Tom