Mesorat%20hashas for Chullin 111:35

תסתיים דרבי יהודה הוא דבדיק בידא

If the bone [of the skull] was broken even though the membrane of the brain had not been pierced [it is trefah]', which shows clearly that the examination is of no avail! - The latter statement refers a water bird for it has no membrane.'

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