PsychoSarah
Chaotic Neutral
What do you mean "based on what"? It stands to reason that marsupials would be driven furthest from placental dominated regions. Is there some magical barrier preventing marsupials migrating somewhere that placentals didn't? I'd love to hear you explain this. But to do that, you'd have to have an argument, and we know you don't like those.
What reason? It doesn't make any sense for marsupials to end up away from placental mammals if they ever shared living space like that. If marsupials could have migrated, so could the placental mammals. The reason why the majority of marsupials are concentrated in small areas is because they evolved that trait on islands, where their population was isolated and they couldn't spread to other land masses. The "magical barrier" is an ocean of water they couldn't swim across.
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