Reference for Chullin 279:1

(דניאל ד, ט) ובענפוהי ידורן צפרי שמיא

It is written: And the zippor of the heaven dwelt in the branches thereof!<span class="x" onmousemove="('comment',' Dan. IV, 9. Since here there is no other synonym for bird mentioned in the verse, then surely the term 'zippor' includes all, both clean and unclean birds.');">¹</span>

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