Reference for Chullin 103:17

בתרי גפי כ"ע לא פליגי דאסיר

But he that permits it says: It can keep aloft in the air by the movement of its wings at the joints.<span class="x" onmousemove="('comment',' Since only the tips of its wings are glued to the board the bird can in a restricted way jerk its wings at the joints and thus keep aloft.');">⁹</span>

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