Mapusaurus

Mapusaurus was a giant South American meat-eating dinosaur with blade-like teeth for slicing off chunks of
flesh. At over ten metres long Mapusaurus was similar in size to the closely related Giganotosaurus. from at least seven individuals of various ages were discovered in a bone bed in Argentina. This may suggest they worked in groups to take down the large of the time, such as the colossal , something a single Mapusaurus may not have been able to accomplish alone. Alternatively this group find may represent a simple predator-trap.

Source: http://www.bbc.co.uk/nature/life/Mapusaurus

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