does it serve a purpose for us to still have them aside from the obvious? i mean after birth. what about for animals *not* having them once they’re born? i was wondering specifically about rats and puppies. i’ve had both as babies and they all had a little black spot for a week or two, then it disappeared for good. when the rats were still pink with no fur i actually saw the black spot dissipate over time within like a week and a half or so
In: Biology
Humans have larger umbilical cords relative to dogs and rats, so our belly button is much bigger and can’t go away like theirs do. Our primate cousins also have similar belly buttons to ours, and larger mammals like horses, elephants etc. have visible belly buttons.
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