The heron the lapwing - Rather, the great plover the hoopoe, so called from its peculiar cry.

The stork - חסידה chasidah, from חסד chasad, which signifies to be abundant in kindness, or exuberant in acts of beneficence; hence applied to the stork, because of its affection to its young, and its kindness in tending and feeding its parents when old; facts attested by the best informed and most judicious of the Greek and Latin natural historians. See Bochart, Scheuchzer, and Parkhurst, under the word חסד chasad. It is remarkable for destroying and eating serpents, and on this account might be reckoned by Moses among unclean birds.
The heron - אנפה anaphah. This word has been variously understood: some have rendered it the kite, others the woodcock, others the curlew, some the peacock, others the parrot, and others the crane. The root אנף anaph, signifies to breathe short through the nostrils, to snuff, as in anger; hence to be angry: and it is supposed that the word is sufficiently descriptive of the heron, from its very irritable disposition. It will attack even a man in defense of its nest; and I have known a case where a man was in danger of losing his life by the stroke of a heron's bill, near the eye, who had climbed up into a high tree to take its nest. Bochart supposes a species of the eagle to be meant, vol. iii., col. 335.
The lapwing - דוכיפת duchiphath, the upupa, hoopoe, or hoop, a crested bird, with beautiful plumage, but very unclean. See Bochart, and Scheuchzer. Concerning the genuine meaning of the original, there is little agreement among interpreters.
The bat - עטלף atalleph, so called, according to Parkhurst, from עט at, to fly, and עלף alaph, darkness or obscurity, because it flies about in the dusk of the evening, and in the night: so the Septuagint νυκτερις, from νυξ, the night; and the Vulgate vespertilio, from vesper, the evening. This being a sort of monster partaking of the nature of both a bird and beast, it might well be classed among unclean animals, or animals the use of which in food should be avoided.

And the stork,..... A bird of passage, Jeremiah 8:7 it has its name from kindness, which it exercises both to its dam, and to its young. Various writers (b) speak of the kindness of these birds to their dams, which when they are old they take care of and feed them, to which the apostle is thought to allude, 1-Timothy 5:4 and its tenderness to its young is no less manifest: when the city of Delf in Holland was on fire, the storks were seen very busy to save their young from the flames, and which when they could not do, threw themselves into the midst of them, and perished with them, as Drusius from the Dutch historians relates. It is said to feed upon serpents; and hence by Virgil (c) to be "invisa colubris"; and Juvenal (d) says, it nourishes its young with them; and which may be a reason of its being forbid to be eaten, and is the reason given by the Mahometans (e) for the prohibition of it; though on this account it was in great honour in Thessaly, that country being freed from serpents by it, and therefore they made it a capital crime to kill them, as Pliny (f) relates; formerly people would not eat the stork, but at present it is much esteemed for the deliciousness of its flesh (g).
the heron after her kind; this bird has its name in Hebrew from its being soon angry, as Aben Ezra observes; and Jarchi calls it the angry vulture or kite, as it is in the Talmud (h); and adds, and it appears to me to be what they call the "heron", one sort of which named "asterias", as there is one sort so called by Pliny (i); it becomes tame in Egypt, and so well understands the voice of a man, as Aelianus (k) reports, that if anyone by way of reproach calls it a servant or slothful, it is immediately exceeding angry. There are three kinds of herons, as both Aristotle (l) and Pliny (m); and by a learned man of ours (n), their names are thus given, the criel or dwarf heron, the blue heron, and the bittour; some reckon nineteen:
and the lapwing; the upupa or hoopoe; it has its name in Hebrew, according to Jarchi, from its having a double crest; and so Pliny (o) ascribes to it a double or folded crest, and speaks of it as a filthy bird; and, according to Aristotle (p) and Aelian (q), its nest is chiefly made of human dung, that by the ill smell of it men may be kept from taking its young; and therefore may well be reckoned among impure fowl. Calmet (r) says, there is no such thing as a lapwing to be seen in any part of England; but there are such as we call so, whether the same bird with this I cannot say:
and the bat; a little bird which flies in the night, Aben Ezra says; Kimchi (s) describes it a mouse with wings, which flies in the night, and we sometimes call it the "flitter mouse"; it is a creature between a fowl and a beast; and, as Aristotle says (t), it partakes of both, and is of neither; and it is the only fowl, as Pliny (u) observes, that has teeth and teats, that brings forth animals, and nourishes them with milk. It is a creature so very disagreeable, that one would think almost there was no need of a law to forbid the eating of it; and yet it is said by some to be eatable, and to be eaten, as Strabo (w) affirms, yea, to be delicious food. It is asserted (x), that there is a sort of them in the east, larger than ordinary, and is salted and eaten--that there are bats in China as large as pullets, and are as delicate eating. Of these several fowls before mentioned, some are of the ravenous kind, and are an emblem of persecutors and covetous persons, and such as live by rapine and violence; others are of a lustful nature, and are an emblem of those who serve various lusts and pleasures, and give up themselves to uncleanness; others are night birds, and are a proper emblem of them whose works are works of darkness, and love darkness rather than the light; and others never rise higher than the earth, and so may denote earthly minded persons; and others live on impure things, and so fitly represent such who live an impure life; with all such the people of God are to have no fellowship.
(b) Aristot. Hist. Animal. l. 9. c. 13. Aelian. de Animal. l. 3. c. 23. & l. 10. c. 16. Plin. Nat. Hist. l. 10. c. 23. (c) Georgic. l. 2. (d) Satyr. 14. (e) Apud Bochart. ut supra, (Hierozoic. par. 2. l. 2.) c. 29. col. 329. (f) Ut supra. (Plin. Nat. Hist. l. 10. c. 23.) (g) Calmet in the word "Stork". (h) T. Bab. Cholin, fol. 63. 1. (i) Ut supra, (f)) c. 60. so Aristot. l. 9. c. 1. (k) De Animal. l. 5. c. 36. (l) Hist. Animal. l. 9. c. 1. (m) Ut supra. (Plin. Nat. Hist. l. 10. c. 23.) (n) Ainsworth's Dictionary, in voce "Ardea". (o) Nat. Hist. l. 10. c. 29. (p) Hist. Animal. l. 9. c. 15. (q) De Animal. l. 3. c. 26. (r) Dictionary, in the word "Lapwing". (s) Sepher Shorash. in voc. (t) De Part. Animal. l. 4. c. 13. (u) Nat. Hist. l. 10. c. 61. l. 11. c. 37. (w) Geograph. l. 16. (x) Calmet's Dictionary in the word "Bat".

the stork--a bird of benevolent temper and held in the highest estimation in all Eastern countries; it was declared unclean, probably, from its feeding on serpents and other venomous reptiles, as well as rearing its young on the same food.
the heron--The word so translated only occurs in the prohibited list of food and has been variously rendered--the crane, the plover, the woodcock, the parrot. In this great diversity of opinion nothing certain can be affirmed regarding it. Judging from the group with which it is classified, it must be an aquatic bird that is meant. It may as well be the heron as any other bird, the more especially as herons abound in Egypt and in the Hauran of Palestine.
the lapwing--or hoopoe; found in warm regions, a very pretty but filthy species of bird. It was considered unclean, probably from its feeding on insects, worms, and snails.
the bat--the great or Ternat bat, known in the East, noted for its voracity and filthiness.