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I read somewhere that , in a percentage of those pure for tufts , the nodule that the tufts grow on develope inward into the brain of the developing chick , killing the chick in the later stages of developement while still in the egg . I don;t know if this is true or not .
if you read araucana under breeds it tells about the lethal gene, not much mind I guess its just safer to take the experts word on it lol