Halakha Ulangan 14:13: Mishneh Torah, Forbidden Foods

The Torah does not mention the distinguishing features of kosher birds, but only lists the non-kosher species. All unlisted species are allowed. The twenty-four non-kosher species are these: 1) Eagle; 2) Bearded Vulture; 3) Black Vulture; 4) Kite, which is the ra'ah in Deuteronomy (Deut. 14:13); 5) Hawk, that is the da'ah in Deuteronomy (ibid.); 6) species of hawk, because for the hawk is written "after its kinds" (Lev. 11:14), so it includes two species; 7) Raven; 8) Starling, because for the raven is written "after its kinds" (Lev. 11:15), it includes the starling; 9) Ostrich; 10) Swallow; 11) Gull; 12) Falcon; 13) Shrike, it is a kind of falcon, because it says "after its kinds" (Lev. 14:16); 14) Little Owl; 15) Osprey; 16) Long-Eared Owl; 17) Barn Owl; 18) Swan; 19) Egyptian Vulture; 20) Stork; 21) Heron; 22) species of heron, because for the heron is written: "according to his kind" (Lev. 11:19); 23) Hoopoe; 24) Bat.