I haven't done a ton of research into it, but to my knowledge, at this point it's hard to be sure of the identities of a lot of the birds mentioned. I don't really know, although I'd like to.
Yes, indeed, they are mentioned, along with every other specie, known and unknown, for God describes them to us, solely by simple criteria, to determine if they are for consumption or not.
For example, fish must have the combination of fins and scales in order for them to qualify as clean for consumption. Through the traditions of men, however, it's been added, not by God, but men, that bottom feeders are unclean as well; but this is not true: the only criteria for determination of cleanliness for consumption is whether or not they have the combination of fins and scales, period.
This is also the case for land animals, they must have the combination of cloven hoof and rumination: some key animals are given as examples, such as swine, for they have cloven feet, but do not ruminate, and the hare, for it ruminates, but does not have a cloven foot, etc.
Fowl also have a simple criteria: any that dwell in the water are unclean, and any that go on four (this is referring to their toes, like the cattle must split the hoof, birds must fly if they go on four toes), yet do not fly, are unclean: therefore, large birds, such as the ostrich, which go on two, are indeed clean. --pretty cool about the ostrich, cause that thing is a huge meat bird, along with the cassowary, etc.
Special fowl are mentioned, by categories, such as raptors, ravens, owls, etc.: they are all unclean, and easy to distinguish from other kinds of fowl, especially since God describes them generally, by kind, with examples, so that there can be no confusion.
Interestingly, chickens have been the subject of controversy amongst those who are seeking to understand, this is because of the work of man, who has inbred the chicken to such a degree, as to cause harm to it's physical attributes, namely, flying: thus, most people usually see chickens that don't fly; but that is far from the truth, they do fly, and so do turkeys, lol. (same category, by the way.)
There is much to say about the simplicity found in these commands, and how man, has through tradition, and translation, muddled the meaning of much of what is said.
Feel free to ask away.
Godspeed.
