I know all the fowls of the mountains - That is, I am fully acquainted with their numbers; their nature; their habits; their residence. I have such a knowledge of them that I could appropriate them to my own use if I were in need of them. I am not, therefore, dependent on people to offer them, for I can use them as I please.
And the wild beasts of the field are mine - Margin, "with me." That is, they are before me. They are never out of my presence. At any time, therefore, I could use them as I might need them. The word rendered "wild beasts" - זיז zı̂yz - means any moving thing; and the idea here is, whatever moves in the field, or roams abroad. Everything is his - whether on the mountains, in the forest, or in the cultivated field.

I know all the fowls of the mountains,.... God not only knows them, but takes care of them; not a sparrow fails to the ground without his knowledge, and all the fowls of the air are fed by him, Matthew 10:29; and therefore needed not their turtledoves and young pigeons, which were the only fowls used in sacrifice;
and the wild beasts of the field are mine; which are mentioned in opposition to domestic ones, such as they had in their houses or folds, Psalm 50:9.

The fowls - Such as are wild and fly up and down upon mountains.