I'm not exactly what type of creature this song sparrow was after (maybe a water strider or a spider?), and I'm not exactly sure what the outcome of this encounter was, but I must that that I was surprised to see that I had captured this action. The sparrow is chasing some type of creature. Just follow its beak and you'll see it.
After a long absence, I'm participating in Misty Dawn's Camera Critters Meme. Go here to see what other animal bloggers are photographing.