Boyd’s Bible Dictionary:
(flying). The Hebrew original embraces birds in general (Gen. 1:20; 1 Kings 4:23). The Greek provides the domestic limitation (Luke 12:24).
“Birds” From Concise Bible Dictionary:
These are employed as symbols of evil agents: as, in the dream of Pharaoh’s baker, the birds ate the bakemeats he was carrying on his head (Gen. 40:17); and in the parable of the Sower the fowls or birds which devoured the seed by the wayside are interpreted by Christ to signify “the wicked one” (Matt. 13:4,19). In the parable of the Mustard Seed the kingdom of heaven becomes a great system with roots in the earth, under the protection of which the birds of the air find shelter (Matt. 13:31-32). The Greek is πετεινόν, the same in the two parables.
“Fowl” From Concise Bible Dictionary:
This term is used for every description of bird described as of the heaven and of the air, including those that feed on carrion, as in Genesis 15:11 and Revelation 19:17, 21; and those for the table (1 Kings 4:23; Neh. 5:18).
Strong’s Dictionary of Greek Words:
Meaning:
neuter of a presumed derivative of 3733; a birdling