“What Happened to South America’s Megafauna?”
I once wondered about this, but the answer is pretty simple.
I did make the assumption that there was not substantially less gravity back then just because I wondered how that could happen also.
So today we mostly have whales in the water, but not much larger things than elephants on land.
in order for larger things other than trees to be viable there would need to be a much denser atmosphere with a lot more carbon dioxide to feed the plant life which in turn produces lots of oxygen and feeds the herbivores, and as they multiply the carnivores do too.
It is not that hard to understand
