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What is the belly button and does it serve any purpose?
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TIL - Kangaroos don't have belly buttons. Marsupials and monotremes don't feed their unborn offspring via a placenta so have no umbilicus. : r/todayilearned
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So ... Do Dogs Have Belly Buttons? – Furtropolis by Outward Hound
What is the belly button and does it serve any purpose?
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