God sends quails to feed his people until they were "two cubits [about a meter] high upon the face of the earth." Taking
the "face of the earth" to be a circle with a radius of say 30 kilometers (an approximate day's journey), this would amount to 3
trillion (3x1012) liters of quails. At 2 quails per liter, this would provide a couple million quails for each of several million
people.
Although this story is obviously exaggerated, it may have grown from a grain of truth. Common Quail
(Cotumix cotumix) migrate twice a year between Africa and Eurasia, and occasional
storm-induced "fallout" could make quail appear to rain from the sky. 11:31