77729
If so , this would be the first substantive evidence of gregarious behavior by large theropods other than " Tyrannosaurus " , although whether they might have hunted in organized packs ( as wolves do ) or simply attacked in a mob , is unknown .
 Tyrannosaurus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tyrannosaurus