The wild asses … in the high places; rather, on the bare heights. "The wild asses," says a traveler cited by Rosenmüller," are especially fond of treeless mountains." Like dragons; render rather, like jackals (as Jeremiah 9:11; Jeremiah 10:22).
The allusion is to the way jackals hold their head as they howl. We are told that even the keen eyes of the wild asses fail, because there was [is] no grass; rather, herbage. They grow dim first with seeking it so long in vain, and then from lack of nourishment.