Midrash for Chullin 278:57
אלא אימא
Surely 'zippor' includes both clean and unclean birds, and 'winged' includes locusts! - No, 'zippor' refers only to clean birds, and 'winged' includes both unclean birds and locusts.
Sifrei Devarim
(Devarim 22:6) "If there chance before you a bird's nest": to exclude what is normally found there.
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