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lamb-birth
Why do humans need to cut their umbilical cord but not other mammals or animals? - Quora
Do Birds Have Belly Buttons? | Bird Spot
Do Dogs Have Belly Buttons?
Why do humans need to cut their umbilical cord but not other mammals or animals? - Quora
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Curious Kids: do all animals have belly buttons?
Do other mammals have umbilical cords? If yes, what do those animals do about them? Do they cut them off like humans do? - Quora
Do Dogs Have Belly Buttons? | Psychology Today
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Do Dogs Have Belly Buttons? | HowStuffWorks
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Do Dogs Have Belly Buttons?
