"The clean species of birds have a 'crop" which prepares the grain and food before entering its stomach and a gizzard with a double lining which can be separated. They bring their food to the ground and divide it with their bills. They have a toe-spread, so that three front ones can be on one side of a perch, and a hind one at the back.
"And these you shall regard as an abomination among the birds; they shall not be eaten: the eagle, the hawk, the vulture, the red kite, the black kite, all owls, all ravens, the cormorant, osprey, storks, pelicans, falcons, ravens, cuckoos, woodpeckers, parrots, ostrich, emu, herons, the hoopoe bats, the sea gulls (and all other aquatic and wading birds, excluding the swan and ducks). [The Hebrew word teshemet does not mean "swan", but rather refers to both a water hen and a species of owl] Leviticus 11:13-19
Unclean birds will devour their food in the air or press it down with their feet and tear it apart with their bills as they have a different digestive system. Birds who lack any of the specifications for clean birds, fall into the unclean category."
Hebrew Roots/Unclean foods/Diseases - Wikibooks, open books for an open world
Would you say they would be considered clean or unclean according to the above article?