He roams the mountains for pasture, searching for any green thing.
God here shows Job what little acquaintance he had with the untamed creatures that run wild in the deserts and live at large, but are the care of the divine Providence. As, I. The wild goats and the hinds. That which is taken notice of concerning them is the bringing forth and bringing up of their young ones.
Commenting on Job 39:1-12
The range of the mountains is his pasture,.... It ranges about the mountains for food; it looks about for it, as the word signifies, and tries first one place and then another to get some, it having short commons there; and he searcheth after every green thing; herb or plant, be it what it will that is green, it seeks after; and which being scarce...
The range--literally, "searching," "that which it finds by searching is his pasture."