Job 39:5

For vain man would be wise, though man be born like a wild ass’s colt.

Behold, as wild asses in the desert, go they forth to their work; rising betimes for a prey: the wilderness yieldeth food for them and for their children.

Doth the wild ass bray when he hath grass? or loweth the ox over his fodder?

They give drink to every beast of the field: the wild asses quench their thirst.

A wild ass used to the wilderness, that snuffeth up the wind at her pleasure; in her occasion who can turn her away? all they that seek her will not weary themselves; in her month they shall find her.

And he will be a wild man; his hand will be against every man, and every man’s hand against him; and he shall dwell in the presence of all his brethren.

Because the palaces shall be forsaken; the multitude of the city shall be left; the forts and towers shall be for dens for ever, a joy of wild asses, a pasture of flocks;

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.

Issachar is a strong ass couching down between two burdens:

And he was driven from the sons of men; and his heart was made like the beasts, and his dwelling was with the wild asses: they fed him with grass like oxen, and his body was wet with the dew of heaven...

For they are gone up to Assyria, a wild ass alone by himself: Ephraim hath hired lovers.