'Birds of the Air' in the Bible

“The sower went out to sow his seed; and as he sowed, some fell beside the road and it was trampled underfoot, and the birds of the sky ate it up.

And Jesus said unto him, Foxes have holes, and birds of the air have nests; but the Son of man hath not where to lay his head.

It is like a mustard seed, which a man took and threw into his own garden; and it grew and became a tree, and the birds of the air nested in its branches.”