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Kangaroo belly buttons

Question: We are having a heated debate in my laboratory. The question is:
Do kangaroos have navels?  I say that marsupials do not.  Can anyone
back me up on this and restore peace to our lab?  (In case you're
wondering, we're microbiologists, so mammalogy is foreign to us!)
Thanks!  M.J.

Answer:
No.
Female marsupials have no placenta:
Therefore, no umbilical cord; therefore, no "belly button."
Jade Hawk

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