Midrash su Levitico 22:19

2) If so, why "a man, a man"? To include gentiles, who vow votive (offerings) and gift-offerings as a Jew does "which" they will present to the L–rd as a burnt-offering": This tells me only of a burnt-offering. Whence do I include peace-offerings? From "their vows." Whence do I include the thank-offering? From "their free-will offerings. Whence do I include bird-offerings, meal-offerings, wine, frankincense, and wood? From "of all their vows," "of all their free-will offerings." If so, why is it written "which they will present to the L–rd as a burnt-offering"? To exclude the burnt-offering of a Nazirite. (Naziriteship not "taking" with a gentile). These are the words of R. Akiva. R. Yossi Haglili said to him: Even if you "include" a whole day, only a burnt-offering obtains (i.e., Whatever he brings becomes a burnt-offering). (Vayikra 22:19) According to your wills, a male without blemish, of the cattle, of the sheep, and of the goats.") (According to your wills": No coercion is exercised for the presentation of communal offerings. "a male without blemish, of the cattle, of the sheep, and of the goats": The absence of blemishes and maleness are criteria for beasts but not for birds. I might think (even) if its wing withered, if its eye were gouged out or its leg cut off; it is, therefore, written (Vayikra 1:14) "of the bird," and not all of the bird.

3) "from the fowl" — and not all the fowl. Because it is written (Ibid. 22:19): "a male without blemish, in the cattle, in the sheep, and in the goats," implying that "unblemished male" is a requirement only in the above, but not in fowl, I might think that it is kasher even if its wing were dried up, its eye dug out, or its leg cut off; it is, therefore, written: "from the fowl" — and not all the fowl.