The possibility of an earlier modern human migration out of Africa—at least as far back as 220,000 y

Ahem
marsupials seem to have evolved in south america
when australia, new zealand, and south america were connected to antarctica
they migrated
Australia's isolation allowed them to flourish without having to compete with placental mammals

We still have a few left in the americas

I wonder what fossils could be found under the antarctic ice?

addendum to above
monotremes seem to have evolved in Australia (or New Guinea?)

 

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