Why are ancient animals big and huge compare to modern animals?

Humans are very good at hunting large animals and it is likely that the Clovis point was responsible for the extinction of many that hadn’t evolved to withstand modern humans. The reason that many of the dinosaurs were larger is probably more related to the food that was available. The early trees and vegetation were suitable to being eaten by very large animals. It is harder to get enough with grass and modern plants that often produce toxins. Some of the mammals did get very large but not as big as some of the sauropods.

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