What is this Pasuk coming to teach us?
Rashi (citing the Sifra): It teaches us that someone who eats the Neveilah of a Tahor (Kasher) bird becomes Tamei, and is forbidden to eat Kodshim (or to enter the Beis-Hamikdash). 1
Ramban, Moshav Zekenim, Targum Onkelos and Targum Yonasan: It is a warning against eating Neveilos (animals that died without Shechitah) and T'reifos 2 (they were mortally injured) - by a lion or a bear. He will become Tamei (through moving or touching them) and forbidden to eat Kodshim until the night after he Tovels.
Rashbam: It teaches us that a Kohen is forbidden to eat the Nieveilah of a Tamei bird. 3
Having already taught us this Halachah (11:39), why does the Torah repeat it here?
Rashbam: Bearing in mind that the Torah is speaking here to the Kohanim, it teaches them that, even though they are permitted to eat a Chatas ha'Of on which Melikah was performed (and which is therefore technically a Neveilah), they are not permitted to eat any other form of Neveilah. 1
Why does the Torah add the word "Letam'ah bah"?