Reference for Chullin 106:2

כי פליגי דאיהו קא שתיק ואינהו קמקרקרן מר סבר

Their dispute arises only where the lion was silent and they were lowing; one [Samuel] is of the opinion that this is an indication that it has already attacked them, whereas the other [Rab] is of the opinion that they are lowing out of fear only.

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