This creature is a mammal and serves as a meat source for a traditional castithan dish, so we can suppose that it is either originated from daribo or it serves as a substitution.
He is used in a ritual castithan pass for the aniatavo which have to cook for the family (maybe to prove that he will be a good wife), the creature is dispose in some kind of metal wire rack who allow to withdraw part of the internal organs and put it in a cooking pot with others ingredients.
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The creature in the Tarr's table
Christie levied some organs in the open belly of the mamal