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Are there any live-birth mammals without belly buttons?

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Marsupials = no belly button; no umbilical cord. Placental mammals = belly button, umbilical cord. read more

Non-placental mammals include monotremes (metatherian mammals), which lay eggs, and marsupials (prototherian mammals), which nurture their young in a pouch. Non-placental mammals do not have belly buttons. read more

As a result, your pets might not have the most obvious belly buttons. Chimpanzees and gorillas have ones similar to a human in shape, but they do not go in or out. Of course, there are always exceptions: platypuses and marsupials do not have belly buttons. Platypuses lay eggs, so there is no umbilical cord. read more

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