Mapusaurus 2
Mapusaurus is a mid size therapod from South America.  Unlike most carnivores these therapods hunt in gangs, but that is not the difference.  It is that it cultivate its prey.  It slices off chuncks of meat from the large sauropods.  By doing this the sauropods are not killed able to recover.  But there is problem with this cultivating they tend to get crushed by the sauropods.  Mapusaurus alone is not a threat to any dinosaur alive at the time.
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