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Ptilodus was an ancient mammal heavily resembling a squirrel

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While dinosaurs were busy dying out in spectacular fashion, early mammals like Ptilodus were just entirely unbothered, hanging out in trees. This peculiar little creature looked incredibly similar to a modern squirrel, proving that nature firmly believes highly annoying, twitchy rodents are absolutely fundamental to any successful terrestrial ecosystem.

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Ptilodus was an ancient mammal heavily resembling a squirrel
STACKY / Science
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