Marsupial by Ciro Santilli 37 Updated 2025-07-16
They split up from the rest of the mammals after the monotremes.
Every other mammal has a placenta.
This baby in pouch thing just feels like a pre-placenta stage.
Los Alamos, New Mexico by Ciro Santilli 37 Updated 2025-07-16
Video 1.
This is why we moved here by Syd and Macky (2022)
Source.

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