I've always wondered: what's behind the belly button?
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A close up of a newborn males umbilical cord with clamps in place just after the cord had been cut Stock Photo - Alamy
Do animals cut the umbilical cord of newborns like humans do? | New Scientist
What is the male belly button for? - Quora
Umbilical Cord Facts - 10 Interesting Facts | BellyBelly
Umbilical cord - Wikipedia
What's the purpose of belly buttons, nipples (for men) and Adam's apple? If it doesn't have any purposes, why didn't we evolve it out of existence? - Quora
Umbilical Cord Blood Gas Tests - ABC Law Centers
Innie Belly Button vs. Outie Belly Button: Causes & More
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