Boyd’s Bible Dictionary:
(quackers). Quails of the Old World species, Coturnix coturnix, abound in the Arabian desert, and migrate northward, in spring, in enormous flocks (Ex. 16:13; Num. 11:31-32; Psa. 105:40).
Concise Bible Dictionary:
Quail and Quail Eggs
This is generally believed to have been the common quail, the coturnix vulgaris. It migrates, but is so tired when it arrives at its destination that it is easily captured. They are still called salwah by the Arabs. Scripture speaks of their being brought with the wind, and this agrees with their habits; they do not seem to be able to fly against the wind, and therefore wait for a favorable breeze. They were twice provided in abundance for the Israelites. The statement about the birds being “two cubits high upon [or above] the face of the earth” (Num. 11:31) doubtless refers to the height they flew when tired; and this corresponds with the way in which they are still caught, namely, by a number of persons enclosing them in a ring and gradually drawing closer to the center, when the birds would be crowded together in their endeavor to escape. Thousands have been caught in a day in modern times (Ex. 16:13; Num. 11:31-32; Psa. 105:40).