Matthew Poole and continuators on Jeremiah 14:6

6 And the wild asses did stand in the high places, they snuffed up the wind like dragons : their eyes did fail because there was no grass h.

The wild Asses wanting water, got upon high places, where was the freest and coolest air, and sucked in the Wind, and this it is said they did like Dragons of whom Aristotle and Pliny report, that by reason of the great heat of their bodies, they ordinarily stand upon high places sucking in the cool Air, and they tell us those Creatures will live upon it for some time. The Prophet describing this great drought, tells us, the wild Asses did the like.

But for want of Grass their eyes were either almost sunk in their heads, they being almost starved, or else the phrase signifies the frustration of their expectation, which this phrase also sometimes signifies in Scripture, Psal. 69.3.