'Birds of the Air' in the Bible

The sower went forth to sow his seed; and as he sowed, some fell by the wayside, and it was trodden down, and the birds of the air ate it up.

And Jesus said to him: The foxes have dens, and the birds of the air have roosts, but the Son of man has not where to lay his head.

It is like a grain of mustard, which a man took, and sowed in his garden; and it grew, and became a great tree; and the birds of the air roosted in its branches.