We shall never know for sure. An unfortuante reality of paleontology is that your work depends primarily on fossilized bones. First of all fossils can’t tell you much about they way and animal died since mostly injuries and disease effect the soft tissue. Second we only have a tiny sample of the entire poplution that is preserved. That said the timing of the extinctions and the arrival of man coincide quite well and it is not uncommon that an invasive predatory species (as man was) can drive species to extinction that had no natural predators before. Of course it could also be argued that the extintions coincided roughly with the end of te last ice age and that it was climatic changes that caused them. For now we can only guess.
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