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There's that accursed born-from-eggs Mudokon belly button.
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I've read somewhere that if you look closely at some egg animals you can see something that resembles a belly button where their yolk sack finished absorbing into their body since egg born animals get their nutrients from the yolk.
Soo in theory...I guess..mudokon belly buttons..might make sense?
So there's a weird theory for ya, idk tbh. I haven't been going around checking birds and reptiles for belly buttons so :\