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The first primates may have evolved in the cold, not the tropics

A surprising new study suggests the earliest primates didn't originate in tropical forests but in cold, dry parts of North America. Some may have even survived seasonal Arctic conditions by slowing their metabolism or hibernating. Researchers found that dramatic climate shifts, rather than warmth, played a major role in driving primate evolution and expansion. The discovery reshapes our understanding of how our own lineage began.

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