Mapusaurus roseae means “red earth lizard” named after a dig sponsor, Rose Letwin, and for the rock strata color of the formation where its fossils were found. Although not the biggest theropod on record, these carcharodontosaurs (shark toothed reptiles) perhaps were tolerant enough of each other to hunt in fearsome packs, bringing down prey as immense as whales.
Several individuals of various ages were discovered in a rare and isolated bonebed, though, not inclusive of pack behavior a group would be able to take on gigantic residents such as a fully grown Argentinosaurus, about thirty-five meters and eighty tons of titanosaur. Their serrated teeth unlike those of tyrannosaurs would be perfectly suited for mob attacks on large prey where bones would be too big to crush but flesh could be easily sliced off in sizeable chunks. Any sauropod who could not fend off swarming Mapusauruses would eventually succumb to a grizzly death either by blood loss or infection.