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UMBILICAL CORD: WHELPING WARNING | TheDogPlace.org
Why do humans need to cut their umbilical cord but not other mammals or animals? - Quora
Do other mammals have umbilical cords? If yes, what do those animals do about them? Do they cut them off like humans do? - Quora
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Why do humans need to cut their umbilical cord but not other mammals or animals? - Quora
Do all animals have belly buttons?
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