Birds revisited.

I heard a bird singing outside the window this morning. It
sounded so joyful, so care-free, so light-hearted. I went
outside it was still singing. Singing in the tree out front.
Then I heard a flurry of wings and it stopped. Someone walking
by said, "Oh look. That bird caught a worm." Of course, I
thought. Never thought of it before, but no bird could sing with
a worm in its mouth. I do not know why I never thought of it
before. Of course no one can sing with its mouth full.