'Dens' in the Bible

When they bow down in dens -- Abide in a thicket for a covert?

The sun riseth, they are gathered, And in their dens they crouch.

Surely the palace hath been left, The multitude of the city forsaken, Fort and watch-tower hath been for dens unto the age, A joy of wild asses -- a pasture of herds;

and the kings of the earth, and the great men, and the rich, and the chiefs of thousands, and the mighty, and every servant, and every freeman, hid themselves in the dens, and in the rocks of the mountains,