Because science fiction. I mean the Cali twins are a single entity that changes its blood color and tongue color along with it. You can probably find some science out there to explain this stuff, but that’s not my department.
Giraffes have the tip of their tongue black-ish to protect them for UVs so maybe something related? It is definitely possible for a specue to not have a tongue blood-colored is what Im mostly saying.
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sluttyantarc said: maybe they turn their blood colour when they reach adulthood, like their eyes
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vaultedvagabond said: Probably because it would have been a lot harder for karkat to hide his tongue color
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